VANGUARD INDEX TRUST
NSAR-A, 1999-08-19
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<PAGE>      PAGE  1
000 A000000 06/30/99
000 C000000 0000036405
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0.a
000 J000000 U
001 A000000 VANGUARD INDEX FUNDS
001 B000000 811-2652
001 C000000 6106691000
002 A000000 100 VANGUARD BOULEVARD
002 B000000 MALVERN
002 C000000 PA
002 D010000 19355
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 Y
007 B000000  9
007 C010100  1
007 C020100 VANGUARD 500 INDEX FUND
007 C030100 N
007 C010200  2
007 C020200 VANGUARD EXTENDED MARKET INDEX FUND
007 C030200 N
007 C010300  3
007 C020300 VANGUARD TOTAL STOCK MARKET INDEX FUND
007 C030300 N
007 C010400  4
007 C020400 VANGUARD VALUE INDEX FUND
007 C030400 N
007 C010500  5
007 C020500 VANGUARD GROWTH INDEX FUND
007 C030500 N
007 C010600  6
007 C020600 VANGUARD SMALL-CAP INDEX FUND
007 C030600 N
007 C010700  7
007 C020700 VANGUARD MID-CAP INDEX FUND
007 C030700 N
007 C010800  8
007 C020800 VANGUARD SMALL-CAP VALUE INDEX FUND
007 C030800 N
007 C010900  9
007 C020900 VANGUARD SMALL-CAP GROWTH INDEX FUND
007 C030900 N
007 C011000 10
010 A00AA01 THE VANGUARD GROUP, INC.
<PAGE>      PAGE  2
010 B00AA01 801-11953
010 C01AA01 MALVERN
010 C02AA01 PA
010 C03AA01 19355
012 A00AA01 THE VANGUARD GROUP, INC.
012 B00AA01 84-772
012 C01AA01 MALVERN
012 C02AA01 PA
012 C03AA01 19355
013 A00AA01 PRICEWATERHOUSECOOPERS LLP
013 B01AA01 PHILADELPHIA
013 B02AA01 PA
013 B03AA01 19103
014 A00AA01 VANGUARD MARKETING CORPORATION
014 B00AA01 8-21570
018  00AA00 Y
019 A00AA00 Y
019 B00AA00  102
019 C00AA00 VANGUARDGR
020 A000001 BEAR STEARNS & COS. INC.
020 B000001 13-3299429
020 C000001   1241
020 A000002 SMITH BARNEY INC.
020 B000002 13-1912900
020 C000002   1058
020 A000003 INVESTMENT TECHNOLOGY GROUP,INC.
020 B000003 95-4339369
020 C000003   1057
020 A000004 INSTINET CORP.
020 B000004 13-3443395
020 C000004    902
020 A000005 MORGAN STANLEY & CO., INC.
020 B000005 13-2655998
020 C000005    886
020 A000006 CREDIT SUISSE FIRST BOSTON CORP.
020 B000006 13-5659485
020 C000006    499
020 A000007 PAINEWEBBER INC.
020 B000007 13-2638166
020 C000007    367
020 A000008 ABN AMRO INC.
020 B000008 13-3227945
020 C000008    343
020 A000009 WEEDEN & CO.
020 B000009 13-3364318
020 C000009    303
020 A000010 WARBURG DILLON REID LLC
020 B000010 13-3340045
020 C000010    295
021  000000     8028
022 A000001 THE VANGUARD GROUP, INC./POOLED CASH ACCT.
<PAGE>      PAGE  3
022 B000001 23-1945930
022 C000001   5264019
022 D000001   5647797
022 A000002 TROSTER SINGER STEVENS ROTHCHILD CORP.
022 B000002 13-5515160
022 C000002   2285274
022 D000002     68319
022 A000003 VANGUARD GROWTH INDEX FUND
022 B000003 23-2695174
022 C000003    627560
022 D000003    588955
022 A000004 VANGUARD VALUE INDEX FUND
022 B000004 23-2695173
022 C000004    599524
022 D000004    594756
022 A000005 GOLDMAN SACHS & CO.
022 B000005 13-5108880
022 C000005    321085
022 D000005    202392
022 A000006 VANGUARD 500 INDEX FUND
022 B000006 23-1999755
022 C000006      6938
022 D000006    185181
022 A000007 SMITH BARNEY INC.
022 B000007 13-1912900
022 C000007    147738
022 D000007      9488
022 A000008 MORGAN STANLEY & CO., INC.
022 B000008 13-2655998
022 C000008    118276
022 D000008      2098
022 A000009 VANGUARD EXTENDED MARKET INDEX FUND
022 B000009 23-2482430
022 C000009     98380
022 D000009      6457
022 A000010 VANGUARD TAX-MANAGED CAPITAL APPRECIATION FD
022 B000010 23-2764162
022 C000010     41497
022 D000010     44654
023 C000000    9945467
023 D000000    7945098
026 A000000 N
026 B000000 N
026 C000000 N
026 D000000 Y
026 E000000 N
026 F000000 N
026 G010000 N
026 G020000 N
026 H000000 N
027  000000 Y
<PAGE>      PAGE  4
029  00AA00 N
030 A00AA00      0
030 B00AA00  0.00
030 C00AA00  0.00
031 A00AA00      0
031 B00AA00      0
032  00AA00      0
033  00AA00      0
034  00AA00 N
035  00AA00      0
036 B00AA00      0
037  00AA00 N
038  00AA00      0
039  00AA00 Y
040  00AA00 N
042 A00AA00   0
042 B00AA00   0
042 C00AA00   0
042 D00AA00   0
042 E00AA00   0
042 F00AA00   0
042 G00AA00   0
042 H00AA00   0
043  00AA00      0
044  00AA00      0
045  00AA00 N
048  00AA00  0.000
048 A01AA00        0
048 A02AA00 0.000
048 B01AA00        0
048 B02AA00 0.000
048 C01AA00        0
048 C02AA00 0.000
048 D01AA00        0
048 D02AA00 0.000
048 E01AA00        0
048 E02AA00 0.000
048 F01AA00        0
048 F02AA00 0.000
048 G01AA00        0
048 G02AA00 0.000
048 H01AA00        0
048 H02AA00 0.000
048 I01AA00        0
048 I02AA00 0.000
048 J01AA00        0
048 J02AA00 0.000
048 K01AA00        0
048 K02AA00 0.000
058 A00AA00 N
059  00AA00 Y
<PAGE>      PAGE  5
060 A00AA00 Y
060 B00AA00 Y
061  00AA00     3000
062 A00AA00 N
062 B00AA00   0.0
062 C00AA00   0.0
062 D00AA00   0.0
062 E00AA00   0.0
062 F00AA00   0.0
062 G00AA00   0.0
062 H00AA00   0.0
062 I00AA00   0.0
062 J00AA00   0.0
062 K00AA00   0.0
062 L00AA00   0.0
062 M00AA00   0.0
062 N00AA00   0.0
062 O00AA00   0.0
062 P00AA00   0.0
062 Q00AA00   0.0
062 R00AA00   0.0
063 A00AA00   0
063 B00AA00  0.0
077 A000000 N
078  000000 N
080 A00AA00 ICI MUTUAL INSURANCE COMPANY
080 C00AA00   350000
081 A00AA00 Y
081 B00AA00 174
082 A00AA00 N
082 B00AA00        0
083 A00AA00 N
083 B00AA00        0
084 A00AA00 N
084 B00AA00        0
085 A00AA00 Y
085 B00AA00 N
086 A010000      0
086 A020000      0
086 B010000      0
086 B020000      0
086 C010000      0
086 C020000      0
086 D010000      0
086 D020000      0
086 E010000      0
086 E020000      0
086 F010000      0
086 F020000      0
015 A000101 STATE STREET BANK AND TRUST COMPANY
015 B000101 C
<PAGE>      PAGE  6
015 C010101 BOSTON
015 C020101 MA
015 C030101 02110
015 E010101 X
024  000100 Y
025 A000101 MORGAN STANLEY & COS. INC.
025 B000101 13-2655998
025 C000101 E
025 D000101  480882
025 A000102 BEAR STEARNS & COS. INC.
025 B000102 13-3299429
025 C000102 E
025 D000102   44757
025 A000103 PAINEWEBBER GROUP, INC.
025 B000103 13-2638166
025 C000103 E
025 D000103   56138
025 D000104       0
025 D000105       0
025 D000106       0
025 D000107       0
025 D000108       0
028 A010100   3059937
028 A020100         0
028 A030100         0
028 A040100   1433321
028 B010100   2599038
028 B020100         0
028 B030100         0
028 B040100   1065726
028 C010100   2950715
028 C020100    466724
028 C030100         0
028 C040100   1599858
028 D010100   2990798
028 D020100         0
028 D030100         0
028 D040100   1204587
028 E010100   2335983
028 E020100         0
028 E030100         0
028 E040100   1029539
028 F010100   2387066
028 F020100    252970
028 F030100         0
028 F040100   1247515
028 G010100  16323537
028 G020100    719694
028 G030100         0
028 G040100   7580546
028 H000100         0
<PAGE>      PAGE  7
055 A000100 N
055 B000100 N
056  000100 N
057  000100 N
066 A000100 Y
066 B000100 N
066 C000100 N
066 D000100 N
066 E000100 Y
066 F000100 N
066 G000100 N
067  000100 N
068 A000100 N
068 B000100 N
069  000100 Y
070 A010100 Y
070 A020100 Y
070 B010100 Y
070 B020100 N
070 C010100 N
070 C020100 N
070 D010100 Y
070 D020100 N
070 E010100 N
070 E020100 N
070 F010100 Y
070 F020100 Y
070 G010100 Y
070 G020100 N
070 H010100 Y
070 H020100 N
070 I010100 N
070 I020100 N
070 J010100 Y
070 J020100 N
070 K010100 Y
070 K020100 N
070 L010100 Y
070 L020100 Y
070 M010100 N
070 M020100 N
070 N010100 Y
070 N020100 Y
070 O010100 Y
070 O020100 N
070 P010100 Y
070 P020100 Y
070 Q010100 N
070 Q020100 N
070 R010100 N
070 R020100 N
<PAGE>      PAGE  8
071 A000100  12086845
071 B000100   2695642
071 C000100  82492313
071 D000100    3
072 A000100  6
072 B000100    13062
072 C000100   551697
072 D000100        0
072 E000100      972
072 F000100       52
072 G000100    27734
072 H000100        0
072 I000100    37001
072 J000100      222
072 K000100        0
072 L000100     1627
072 M000100       57
072 N000100        0
072 O000100        0
072 P000100        0
072 Q000100        0
072 R000100       23
072 S000100        0
072 T000100     7408
072 U000100        0
072 V000100        0
072 W000100        0
072 X000100    74124
072 Y000100       21
072 Z000100   491628
072AA000100  1523421
072BB000100   108987
072CC010100  7822009
072CC020100        0
072DD010100   461514
072DD020100        0
072EE000100   313840
073 A010100   0.6500
073 A020100   0.0000
073 B000100   0.4550
073 C000100   0.0000
074 A000100        0
074 B000100   299627
074 C000100    32990
074 D000100        0
074 E000100        0
074 F000100 92404893
074 G000100        0
074 H000100        0
074 I000100    13403
074 J000100   437544
<PAGE>      PAGE  9
074 K000100        0
074 L000100   643911
074 M000100        0
074 N000100 93832368
074 O000100   949618
074 P000100    19202
074 Q000100        0
074 R010100        0
074 R020100        0
074 R030100        0
074 R040100   219620
074 S000100        0
074 T000100 92643928
074 U010100   730449
074 U020100        0
074 V010100   126.83
074 V020100     0.00
074 W000100   0.0000
074 X000100  2254289
074 Y000100    32990
075 A000100        0
075 B000100 82948266
076  000100     0.00
015 A000201 STATE STREET BANK AND TRUST COMPANY
015 B000201 C
015 C010201 BOSTON
015 C020201 MA
015 C030201 02110
015 E010201 X
024  000200 Y
025 A000201 INVESTMENT TECHNOLOGY GROUP, INC.
025 B000201 95-4339369
025 C000201 E
025 D000201    1257
025 A000202 THE GOLDMAN SACHS GROUP, INC.
025 B000202 13-5108880
025 C000202 E
025 D000202    5932
025 A000203 DELETE
025 D000203       0
025 D000204       0
025 D000205       0
025 D000206       0
025 D000207       0
025 D000208       0
028 A010200     63525
028 A020200         0
028 A030200         0
028 A040200     76763
028 B010200     57475
028 B020200         0
<PAGE>      PAGE  10
028 B030200         0
028 B040200     52292
028 C010200     80776
028 C020200    165306
028 C030200         0
028 C040200     99668
028 D010200    148750
028 D020200         0
028 D030200         0
028 D040200     83634
028 E010200     92478
028 E020200         0
028 E030200         0
028 E040200     50853
028 F010200     76802
028 F020200         0
028 F030200         0
028 F040200     47440
028 G010200    519806
028 G020200    165306
028 G030200         0
028 G040200    410650
028 H000200         0
055 A000200 N
055 B000200 N
056  000200 N
057  000200 N
066 A000200 Y
066 B000200 N
066 C000200 N
066 D000200 Y
066 E000200 N
066 F000200 N
066 G000200 N
067  000200 N
068 A000200 N
068 B000200 N
069  000200 Y
070 A010200 Y
070 A020200 Y
070 B010200 Y
070 B020200 N
070 C010200 N
070 C020200 N
070 D010200 Y
070 D020200 N
070 E010200 N
070 E020200 N
070 F010200 Y
070 F020200 Y
070 G010200 Y
<PAGE>      PAGE  11
070 G020200 N
070 H010200 Y
070 H020200 N
070 I010200 N
070 I020200 N
070 J010200 Y
070 J020200 Y
070 K010200 Y
070 K020200 N
070 L010200 Y
070 L020200 Y
070 M010200 N
070 M020200 N
070 N010200 Y
070 N020200 Y
070 O010200 Y
070 O020200 N
070 P010200 Y
070 P020200 Y
070 Q010200 N
070 Q020200 N
070 R010200 N
070 R020200 N
071 A000200    493321
071 B000200    383785
071 C000200   3466215
071 D000200   11
072 A000200  6
072 B000200       58
072 C000200    21671
072 D000200        0
072 E000200     2808
072 F000200       69
072 G000200     1092
072 H000200        0
072 I000200     2274
072 J000200       94
072 K000200        0
072 L000200       94
072 M000200        2
072 N000200        0
072 O000200        0
072 P000200        0
072 Q000200        0
072 R000200        5
072 S000200        0
072 T000200      317
072 U000200        0
072 V000200        0
072 W000200        0
072 X000200     3947
<PAGE>      PAGE  12
072 Y000200       20
072 Z000200    20610
072AA000200   184581
072BB000200    37658
072CC010200   228195
072CC020200        0
072DD010200      956
072DD020200      145
072EE000200   179740
073 A010200   0.0100
073 A020200   0.0100
073 B000200   1.6350
073 C000200   0.0000
074 A000200        0
074 B000200   339933
074 C000200     3674
074 D000200        0
074 E000200        0
074 F000200  3799988
074 G000200        0
074 H000200        0
074 I000200      574
074 J000200    25919
074 K000200        0
074 L000200     7314
074 M000200        0
074 N000200  4177402
074 O000200    34910
074 P000200     1051
074 Q000200        0
074 R010200        0
074 R020200        0
074 R030200        0
074 R040200   256933
074 S000200        0
074 T000200  3884508
074 U010200   103041
074 U020200    17069
074 V010200    32.34
074 V020200    32.36
074 W000200   0.0000
074 X000200   112620
074 Y000200     3674
075 A000200        0
075 B000200  3523219
076  000200     0.00
015 A000301 STATE STREET BANK AND TRUST COMPANY
015 B000301 C
015 C010301 BOSTON
015 C020301 MA
015 C030301 02110
<PAGE>      PAGE  13
015 E010301 X
024  000300 Y
025 A000301 MORGAN STANLEY & CO., INC.
025 B000301 13-2655998
025 C000301 E
025 D000301   67283
025 A000302 PAINEWEBBER, INC.
025 B000302 13-2638166
025 C000302 E
025 D000302    7737
025 A000303 BEAR STEARNS & COS. INC.
025 B000303 13-3299429
025 C000303 E
025 D000303    5964
025 A000304 INVESTMENT TECHNOLOGY GROUP, INC.
025 B000304 95-4339369
025 C000304 E
025 D000304    1780
025 A000305 GOLDMAN SACHS & CO.
025 B000305 13-5108880
025 C000305 E
025 D000305    5563
025 D000306       0
025 D000307       0
025 D000308       0
028 A010300    494422
028 A020300         0
028 A030300         0
028 A040300    175733
028 B010300    581164
028 B020300         0
028 B030300         0
028 B040300    131949
028 C010300    669908
028 C020300     95772
028 C030300         0
028 C040300    215291
028 D010300    810730
028 D020300         0
028 D030300         0
028 D040300    169448
028 E010300    689527
028 E020300         0
028 E030300         0
028 E040300    171437
028 F010300    770142
028 F020300     43346
028 F030300         0
028 F040300    155237
028 G010300   4015893
028 G020300    139118
<PAGE>      PAGE  14
028 G030300         0
028 G040300   1019095
028 H000300         0
055 A000300 N
055 B000300 N
056  000300 N
057  000300 N
066 A000300 Y
066 B000300 N
066 C000300 N
066 D000300 N
066 E000300 Y
066 F000300 N
066 G000300 N
067  000300 N
068 A000300 N
068 B000300 N
069  000300 Y
070 A010300 Y
070 A020300 Y
070 B010300 Y
070 B020300 N
070 C010300 N
070 C020300 N
070 D010300 Y
070 D020300 N
070 E010300 N
070 E020300 N
070 F010300 Y
070 F020300 Y
070 G010300 Y
070 G020300 N
070 H010300 Y
070 H020300 N
070 I010300 N
070 I020300 N
070 J010300 Y
070 J020300 Y
070 K010300 Y
070 K020300 N
070 L010300 Y
070 L020300 Y
070 M010300 N
070 M020300 N
070 N010300 Y
070 N020300 Y
070 O010300 Y
070 O020300 N
070 P010300 Y
070 P020300 Y
070 Q010300 N
<PAGE>      PAGE  15
070 Q020300 N
070 R010300 N
070 R020300 N
071 A000300   3499342
071 B000300    202788
071 C000300  13298086
071 D000300    2
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072 C000300    81525
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072 I000300     5925
072 J000300      150
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072 L000300      254
072 M000300        9
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072 O000300        0
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072 R000300        7
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072 T000300     1263
072 U000300        0
072 V000300        0
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072 X000300    12206
072 Y000300       21
072 Z000300    83122
072AA000300   119151
072BB000300    19146
072CC010300  1404074
072CC020300        0
072DD010300    60868
072DD020300    16410
072EE000300    72767
073 A010300   0.1500
073 A020300   0.1620
073 B000300   0.1550
073 C000300   0.0000
074 A000300      524
074 B000300   583750
074 C000300    17378
074 D000300        0
074 E000300        0
074 F000300 15982051
074 G000300        0
<PAGE>      PAGE  16
074 H000300        0
074 I000300     2303
074 J000300    60001
074 K000300        0
074 L000300    54744
074 M000300        0
074 N000300 16700751
074 O000300   129433
074 P000300     2758
074 Q000300        0
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074 R030300        0
074 R040300   242369
074 S000300        0
074 T000300 16326191
074 U010300   429717
074 U020300   108160
074 V010300    30.35
074 V020300    30.36
074 W000300   0.0000
074 X000300   314379
074 Y000300    17378
075 A000300        0
075 B000300 13732803
076  000300     0.00
015 A000401 FIRST UNION NATIONAL BANK
015 B000401 C
015 C010401 PHILADELPHIA
015 C020401 PA
015 C030401 19106
015 E010401 X
024  000400 Y
025 A000401 MORGAN STANLEY DEAN WITTER & CO.
025 B000401 13-2655998
025 C000401 E
025 D000401   38581
025 A000402 BEAR STEARNS & CO., INC.
025 B000402 13-3299429
025 C000402 E
025 D000402    3596
025 A000403 PAINEWEBBER INC.
025 B000403 13-2638166
025 C000403 E
025 D000403    4511
025 D000404       0
025 D000405       0
025 D000406       0
025 D000407       0
025 D000408       0
028 A010400     98095
<PAGE>      PAGE  17
028 A020400         0
028 A030400         0
028 A040400     93228
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028 B040400     56389
028 C010400    111853
028 C020400     87370
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028 C040400     65955
028 D010400    238845
028 D020400         0
028 D030400         0
028 D040400     74740
028 E010400    220247
028 E020400         0
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028 E040400     32012
028 F010400    208842
028 F020400     11637
028 F030400         0
028 F040400     50335
028 G010400    975699
028 G020400     99007
028 G030400         0
028 G040400    372659
028 H000400         0
055 A000400 N
055 B000400 N
056  000400 N
057  000400 N
066 A000400 Y
066 B000400 N
066 C000400 N
066 D000400 N
066 E000400 Y
066 F000400 N
066 G000400 N
067  000400 N
068 A000400 N
068 B000400 N
069  000400 Y
070 A010400 Y
070 A020400 Y
070 B010400 Y
070 B020400 N
070 C010400 N
070 C020400 N
070 D010400 Y
070 D020400 N
<PAGE>      PAGE  18
070 E010400 N
070 E020400 N
070 F010400 Y
070 F020400 Y
070 G010400 Y
070 G020400 N
070 H010400 Y
070 H020400 N
070 I010400 N
070 I020400 N
070 J010400 Y
070 J020400 N
070 K010400 Y
070 K020400 N
070 L010400 Y
070 L020400 Y
070 M010400 N
070 M020400 N
070 N010400 Y
070 N020400 Y
070 O010400 Y
070 O020400 N
070 P010400 Y
070 P020400 Y
070 Q010400 N
070 Q020400 N
070 R010400 N
070 R020400 N
071 A000400   1326070
071 B000400    735002
071 C000400   2959339
071 D000400   25
072 A000400  6
072 B000400      247
072 C000400    26902
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072 E000400       39
072 F000400       34
072 G000400     1103
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072 I000400     1560
072 J000400       29
072 K000400        0
072 L000400       78
072 M000400        2
072 N000400        0
072 O000400        0
072 P000400        0
072 Q000400        0
072 R000400        5
072 S000400        0
<PAGE>      PAGE  19
072 T000400      293
072 U000400        0
072 V000400        0
072 W000400        0
072 X000400     3104
072 Y000400        0
072 Z000400    24084
072AA000400   200416
072BB000400     9392
072CC010400   170272
072CC020400        0
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072DD020400     2076
072EE000400    86081
073 A010400   0.1600
073 A020400   0.1700
073 B000400   0.7200
073 C000400   0.0000
074 A000400        0
074 B000400     9519
074 C000400      399
074 D000400        0
074 E000400        0
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074 L000400     8900
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074 N000400  4174111
074 O000400   582192
074 P000400      726
074 Q000400        0
074 R010400        0
074 R020400        0
074 R030400        0
074 R040400     4603
074 S000400        0
074 T000400  3586590
074 U010400   130348
074 U020400    15098
074 V010400    24.66
074 V020400    24.66
074 W000400   0.0000
074 X000400   104416
074 Y000400      399
075 A000400        0
075 B000400  2962915
076  000400     0.00
<PAGE>      PAGE  20
015 A000501 FIRST UNION NATIONAL BANK
015 B000501 C
015 C010501 PHILADELPHIA
015 C020501 PA
015 C030501 19106
015 E010501 X
024  000500 N
025 A000501 DELETE
025 D000501       0
025 D000502       0
025 D000503       0
025 D000504       0
025 D000505       0
025 D000506       0
025 D000507       0
025 D000508       0
028 A010500    993004
028 A020500         0
028 A030500         0
028 A040500    136774
028 B010500    930336
028 B020500         0
028 B030500         0
028 B040500    123452
028 C010500   1075782
028 C020500     50859
028 C030500         0
028 C040500    152289
028 D010500   1079912
028 D020500         0
028 D030500         0
028 D040500    229720
028 E010500    544458
028 E020500         0
028 E030500         0
028 E040500    296640
028 F010500    378278
028 F020500     18377
028 F030500         0
028 F040500    221306
028 G010500   5001770
028 G020500     69236
028 G030500         0
028 G040500   1160181
028 H000500         0
070 A010500 Y
070 A020500 Y
070 B010500 Y
070 B020500 N
070 C010500 N
070 C020500 N
<PAGE>      PAGE  21
070 D010500 Y
070 D020500 N
070 E010500 N
070 E020500 N
070 F010500 Y
070 F020500 Y
070 G010500 Y
070 G020500 N
070 H010500 Y
070 H020500 N
070 I010500 N
070 I020500 N
070 J010500 Y
070 J020500 N
070 K010500 Y
070 K020500 N
070 L010500 Y
070 L020500 Y
070 M010500 N
070 M020500 N
070 N010500 Y
070 N020500 Y
070 O010500 Y
070 O020500 N
070 P010500 Y
070 P020500 Y
070 Q010500 N
070 Q020500 N
070 R010500 N
070 R020500 N
071 A000500   5801949
071 B000500   1912148
071 C000500   9563634
071 D000500   20
072 A000500  6
072 B000500     1105
072 C000500    43852
072 D000500        0
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072 F000500       34
072 G000500     3728
072 H000500        0
072 I000500     5452
072 J000500       35
072 K000500        0
072 L000500      180
072 M000500        6
072 N000500        0
072 O000500        0
072 P000500        0
072 Q000500        0
<PAGE>      PAGE  22
072 R000500        5
072 S000500        0
072 T000500      897
072 U000500        0
072 V000500        0
072 W000500        0
072 X000500    10337
072 Y000500        0
072 Z000500    34698
072AA000500   366553
072BB000500    57084
072CC010500   641931
072CC020500        0
072DD010500    33664
072DD020500     1045
072EE000500    39380
073 A010500   0.1100
073 A020500   0.1230
073 B000500   0.1350
073 C000500   0.0000
074 A000500     1934
074 B000500     3837
074 C000500      595
074 D000500        0
074 E000500        0
074 F000500 11697936
074 G000500        0
074 H000500        0
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074 K000500        0
074 L000500    29288
074 M000500        0
074 N000500 13518397
074 O000500  1808394
074 P000500     1580
074 Q000500        0
074 R010500        0
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074 R030500        0
074 R040500    17089
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074 T000500 11691334
074 U010500   326187
074 U020500     8588
074 V010500    34.92
074 V020500    34.93
074 W000500   0.0000
074 X000500   434788
074 Y000500      595
075 A000500        0
<PAGE>      PAGE  23
075 B000500  9571103
076  000500     0.00
015 A000601 FIRST UNION NATIONAL BANK
015 B000601 C
015 C010601 PHILADELPHIA
015 C020601 PA
015 C030601 19106
015 E010601 X
024  000600 Y
025 A000601 INVESTMENT TECHNOLOGY GROUP, INC.
025 B000601 95-4339369
025 C000601 E
025 D000601       9
025 D000602       0
025 D000603       0
025 D000604       0
025 D000605       0
025 D000606       0
025 D000607       0
025 D000608       0
028 A010600    134619
028 A020600         0
028 A030600         0
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028 D040600    100713
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028 F040600     60067
028 G010600    592266
028 G020600     21996
028 G030600         0
028 G040600    588707
028 H000600         0
055 A000600 N
055 B000600 N
<PAGE>      PAGE  24
056  000600 N
057  000600 N
066 A000600 Y
066 B000600 N
066 C000600 Y
066 D000600 N
066 E000600 N
066 F000600 N
066 G000600 N
067  000600 N
068 A000600 N
068 B000600 N
069  000600 Y
070 A010600 Y
070 A020600 Y
070 B010600 Y
070 B020600 N
070 C010600 N
070 C020600 N
070 D010600 Y
070 D020600 N
070 E010600 N
070 E020600 N
070 F010600 Y
070 F020600 Y
070 G010600 Y
070 G020600 N
070 H010600 Y
070 H020600 N
070 I010600 N
070 I020600 N
070 J010600 Y
070 J020600 Y
070 K010600 Y
070 K020600 N
070 L010600 Y
070 L020600 Y
070 M010600 N
070 M020600 N
070 N010600 Y
070 N020600 Y
070 O010600 Y
070 O020600 N
070 P010600 Y
070 P020600 Y
070 Q010600 N
070 Q020600 N
070 R010600 N
070 R020600 N
071 A000600   1008145
071 B000600    902449
<PAGE>      PAGE  25
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072 M000600        2
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072 P000600        0
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072 S000600        0
072 T000600      322
072 U000600        0
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072 X000600     3479
072 Y000600        6
072 Z000600    19720
072AA000600   395290
072BB000600   176334
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072CC020600        0
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072EE000600    22336
073 A010600   0.0100
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073 B000600   0.1600
073 C000600   0.0000
074 A000600      504
074 B000600   114736
074 C000600     4000
074 D000600        0
074 E000600        0
074 F000600  3322945
074 G000600        0
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074 I000600      490
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074 L000600     9730
<PAGE>      PAGE  26
074 M000600        0
074 N000600  3678102
074 O000600   222482
074 P000600      957
074 Q000600        0
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074 R030600        0
074 R040600   109454
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074 T000600  3345209
074 U010600   132301
074 U020600    11658
074 V010600    23.24
074 V020600    23.25
074 W000600   0.0000
074 X000600   121703
074 Y000600     4000
075 A000600        0
075 B000600  3030932
076  000600     0.00
015 A000701 FIRST UNION NATIONAL BANK
015 B000701 C
015 C010701 PHILADELPHIA
015 C020701 PA
015 C030701 19106
015 E010701 X
024  000700 Y
025 A000701 INVESTMENT TECHNOLOGY GROUP, INC.
025 B000701 95-4339369
025 C000701 E
025 D000701     528
025 D000702       0
025 D000703       0
025 D000704       0
025 D000705       0
025 D000706       0
025 D000707       0
025 D000708       0
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028 A040700      5020
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028 B020700         0
028 B030700         0
028 B040700      5539
028 C010700     31231
028 C020700     14004
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028 C040700      8806
<PAGE>      PAGE  27
028 D010700     60540
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028 D040700     11763
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028 F040700      3499
028 G010700    240525
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028 G040700     41687
028 H000700         0
055 A000700 N
055 B000700 N
056  000700 N
057  000700 N
066 A000700 Y
066 B000700 N
066 C000700 N
066 D000700 Y
066 E000700 N
066 F000700 N
066 G000700 N
067  000700 N
068 A000700 N
068 B000700 N
069  000700 Y
070 A010700 Y
070 A020700 Y
070 B010700 Y
070 B020700 N
070 C010700 N
070 C020700 N
070 D010700 Y
070 D020700 N
070 E010700 N
070 E020700 N
070 F010700 Y
070 F020700 Y
070 G010700 Y
070 G020700 N
070 H010700 Y
070 H020700 N
070 I010700 N
070 I020700 N
070 J010700 Y
<PAGE>      PAGE  28
070 J020700 N
070 K010700 Y
070 K020700 N
070 L010700 Y
070 L020700 Y
070 M010700 N
070 M020700 N
070 N010700 Y
070 N020700 Y
070 O010700 Y
070 O020700 N
070 P010700 Y
070 P020700 Y
070 Q010700 N
070 Q020700 N
070 R010700 N
070 R020700 N
071 A000700    262308
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072CC010700    23091
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<PAGE>      PAGE  29
072DD010700        0
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072EE000700    15289
073 A010700   0.0000
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073 B000700   0.5100
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074 W000700   0.0000
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075 A000700        0
075 B000700   339298
076  000700     0.00
015 A000801 FIRST UNION NATIONAL BANK
015 B000801 C
015 C010801 PHILADELPHIA
015 C020801 PA
015 C030801 19106
015 E010801 X
024  000800 N
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<PAGE>      PAGE  30
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028 D040800      4395
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055 A000800 Y
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056  000800 N
057  000800 N
066 A000800 Y
066 B000800 N
066 C000800 Y
066 D000800 N
066 E000800 N
066 F000800 N
066 G000800 N
067  000800 N
068 A000800 N
068 B000800 N
069  000800 Y
070 A010800 Y
070 A020800 Y
070 B010800 Y
<PAGE>      PAGE  31
070 B020800 N
070 C010800 N
070 C020800 N
070 D010800 Y
070 D020800 N
070 E010800 N
070 E020800 N
070 F010800 Y
070 F020800 N
070 G010800 Y
070 G020800 N
070 H010800 Y
070 H020800 N
070 I010800 N
070 I020800 N
070 J010800 Y
070 J020800 N
070 K010800 Y
070 K020800 N
070 L010800 Y
070 L020800 Y
070 M010800 N
070 M020800 N
070 N010800 Y
070 N020800 Y
070 O010800 Y
070 O020800 N
070 P010800 Y
070 P020800 Y
070 Q010800 N
070 Q020800 N
070 R010800 N
070 R020800 N
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<PAGE>      PAGE  32
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<PAGE>      PAGE  33
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015 A000901 FIRST UNION NATIONAL BANK
015 B000901 C
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015 E010901 X
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057  000900 N
066 A000900 Y
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066 D000900 N
066 E000900 N
066 F000900 N
<PAGE>      PAGE  34
066 G000900 N
067  000900 N
068 A000900 N
068 B000900 N
069  000900 Y
070 A010900 Y
070 A020900 Y
070 B010900 Y
070 B020900 N
070 C010900 N
070 C020900 N
070 D010900 Y
070 D020900 N
070 E010900 N
070 E020900 N
070 F010900 Y
070 F020900 N
070 G010900 Y
070 G020900 N
070 H010900 Y
070 H020900 N
070 I010900 N
070 I020900 N
070 J010900 Y
070 J020900 N
070 K010900 Y
070 K020900 N
070 L010900 Y
070 L020900 Y
070 M010900 N
070 M020900 N
070 N010900 Y
070 N020900 Y
070 O010900 Y
070 O020900 N
070 P010900 Y
070 P020900 Y
070 Q010900 N
070 Q020900 N
070 R010900 N
070 R020900 N
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<PAGE>      PAGE  35
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<PAGE>      PAGE  36
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SIGNATURE   GARY P. SOURA
TITLE       MANAGER


WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000036405
<NAME> VANGUARD INDEX FUNDS
<SERIES>
   <NUMBER> 1
   <NAME> VANGUARD 500 INDEX FUND
<MULTIPLIER> 1000
<CURRENCY> US

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               JUN-30-1999
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                         53921854
<INVESTMENTS-AT-VALUE>                        92737510
<RECEIVABLES>                                  1081455
<ASSETS-OTHER>                                   13403
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                93832368
<PAYABLE-FOR-SECURITIES>                        949618
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       238822
<TOTAL-LIABILITIES>                            1188440
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      53524918
<SHARES-COMMON-STOCK>                           730449
<SHARES-COMMON-PRIOR>                           651398
<ACCUMULATED-NII-CURRENT>                        23963
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                         270156
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                      38824891
<NET-ASSETS>                                  92643928
<DIVIDEND-INCOME>                               551697
<INTEREST-INCOME>                                13062
<OTHER-INCOME>                                     972
<EXPENSES-NET>                                   74103
<NET-INVESTMENT-INCOME>                         491628
<REALIZED-GAINS-CURRENT>                       1414434
<APPREC-INCREASE-CURRENT>                      7822009
<NET-CHANGE-FROM-OPS>                          9728071
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                       461514
<DISTRIBUTIONS-OF-GAINS>                        313840
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         136337
<NUMBER-OF-SHARES-REDEEMED>                      63305
<SHARES-REINVESTED>                               6019
<NET-CHANGE-IN-ASSETS>                        18415402
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                       296685
<OVERDISTRIB-NII-PRIOR>                           6151
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                               52
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                  74124
<AVERAGE-NET-ASSETS>                          82948266
<PER-SHARE-NAV-BEGIN>                           113.95
<PER-SHARE-NII>                                   0.69
<PER-SHARE-GAIN-APPREC>                         13.295
<PER-SHARE-DIVIDEND>                              0.65
<PER-SHARE-DISTRIBUTIONS>                        0.455
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                             126.83
<EXPENSE-RATIO>                                   0.18
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000036405
<NAME> VANGUARD INDEX FUNDS
<SERIES>
   <NUMBER> 021
   <NAME> VANGUARD EXTENDED MARKET INDEX FUND-INVESTOR SHARES
<MULTIPLIER> 1000
<CURRENCY> US

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               JUN-30-1999
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                          3156903
<INVESTMENTS-AT-VALUE>                         4143595
<RECEIVABLES>                                    33233
<ASSETS-OTHER>                                     574
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                 4177402
<PAYABLE-FOR-SECURITIES>                         34910
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       257984
<TOTAL-LIABILITIES>                             292894
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                       2732758
<SHARES-COMMON-STOCK>                           103041
<SHARES-COMMON-PRIOR>                            95929
<ACCUMULATED-NII-CURRENT>                        19376
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                         143318
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                        989056
<NET-ASSETS>                                   3332117
<DIVIDEND-INCOME>                                21671
<INTEREST-INCOME>                                   58
<OTHER-INCOME>                                    2808
<EXPENSES-NET>                                    3927
<NET-INVESTMENT-INCOME>                          20610
<REALIZED-GAINS-CURRENT>                        146923
<APPREC-INCREASE-CURRENT>                       228195
<NET-CHANGE-FROM-OPS>                           395728
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                          956
<DISTRIBUTIONS-OF-GAINS>                        156006
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          13588
<NUMBER-OF-SHARES-REDEEMED>                      11594
<SHARES-REINVESTED>                               5118
<NET-CHANGE-IN-ASSETS>                          489349
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                       176135
<OVERDISTRIB-NII-PRIOR>                            133
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                               69
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                   3947
<AVERAGE-NET-ASSETS>                           3039975
<PER-SHARE-NAV-BEGIN>                            30.63
<PER-SHARE-NII>                                  0.160
<PER-SHARE-GAIN-APPREC>                          3.195
<PER-SHARE-DIVIDEND>                             0.010
<PER-SHARE-DISTRIBUTIONS>                        1.635
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              32.34
<EXPENSE-RATIO>                                   0.25
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000036405
<NAME> VANGUARD INDEX FUNDS
<SERIES>
   <NUMBER> 022
   <NAME> VANGUARD EXTENDED MARKET INDEX FUND-INSTITUTIONAL SHARES
<MULTIPLIER> 1000
<CURRENCY> US

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               JUN-30-1999
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                          3156903
<INVESTMENTS-AT-VALUE>                         4143595
<RECEIVABLES>                                    33233
<ASSETS-OTHER>                                     574
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                 4177402
<PAYABLE-FOR-SECURITIES>                         34910
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       257984
<TOTAL-LIABILITIES>                             292894
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                       2732758
<SHARES-COMMON-STOCK>                            17069
<SHARES-COMMON-PRIOR>                            14901
<ACCUMULATED-NII-CURRENT>                        19376
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                         143318
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                        989056
<NET-ASSETS>                                    552391
<DIVIDEND-INCOME>                                21671
<INTEREST-INCOME>                                   58
<OTHER-INCOME>                                    2808
<EXPENSES-NET>                                    3927
<NET-INVESTMENT-INCOME>                          20610
<REALIZED-GAINS-CURRENT>                        146923
<APPREC-INCREASE-CURRENT>                       228195
<NET-CHANGE-FROM-OPS>                           395728
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                          145
<DISTRIBUTIONS-OF-GAINS>                         23734
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                           3353
<NUMBER-OF-SHARES-REDEEMED>                       1873
<SHARES-REINVESTED>                                688
<NET-CHANGE-IN-ASSETS>                          489349
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                       176135
<OVERDISTRIB-NII-PRIOR>                            133
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                               69
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                   3947
<AVERAGE-NET-ASSETS>                            483244
<PER-SHARE-NAV-BEGIN>                            30.63
<PER-SHARE-NII>                                  0.180
<PER-SHARE-GAIN-APPREC>                          3.195
<PER-SHARE-DIVIDEND>                             0.010
<PER-SHARE-DISTRIBUTIONS>                        1.635
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              32.36
<EXPENSE-RATIO>                                   0.10
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000036405
<NAME> VANGUARD INDEX FUNDS
<SERIES>
   <NUMBER> 031
   <NAME> VANGUARD TOTAL STOCK MARKET INDEX FUND - INVESTOR SHARES
<MULTIPLIER> 1000
<CURRENCY> US

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               JUN-30-1999
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                         11572171
<INVESTMENTS-AT-VALUE>                        16583179
<RECEIVABLES>                                   114745
<ASSETS-OTHER>                                    2827
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                16700751
<PAYABLE-FOR-SECURITIES>                        129433
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       245127
<TOTAL-LIABILITIES>                             374560
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      11228831
<SHARES-COMMON-STOCK>                           429717
<SHARES-COMMON-PRIOR>                           339456
<ACCUMULATED-NII-CURRENT>                         5602
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                          68559
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       5023199
<NET-ASSETS>                                  13042889
<DIVIDEND-INCOME>                                81525
<INTEREST-INCOME>                                11887
<OTHER-INCOME>                                    1895
<EXPENSES-NET>                                   12185
<NET-INVESTMENT-INCOME>                          83122
<REALIZED-GAINS-CURRENT>                        100005
<APPREC-INCREASE-CURRENT>                      1404074
<NET-CHANGE-FROM-OPS>                          1587201
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        60868
<DISTRIBUTIONS-OF-GAINS>                         58318
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         115032
<NUMBER-OF-SHARES-REDEEMED>                      28716
<SHARES-REINVESTED>                               3945
<NET-CHANGE-IN-ASSETS>                         4573072
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                        41321
<OVERDISTRIB-NII-PRIOR>                            242
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                               69
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                  12206
<AVERAGE-NET-ASSETS>                          10959066
<PER-SHARE-NAV-BEGIN>                            27.42
<PER-SHARE-NII>                                  0.155
<PER-SHARE-GAIN-APPREC>                          3.080
<PER-SHARE-DIVIDEND>                             0.150
<PER-SHARE-DISTRIBUTIONS>                        0.155
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              30.35
<EXPENSE-RATIO>                                   0.20
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000036405
<NAME> VANGUARD INDEX FUNDS
<SERIES>
   <NUMBER> 032
   <NAME> VANGUARD TOTAL STOCK MARKET INDEX FUND -INSTITUTIONAL SHARES
<MULTIPLIER> 1000
<CURRENCY> US

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               JUN-30-1999
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                         11572171
<INVESTMENTS-AT-VALUE>                        16583179
<RECEIVABLES>                                   114745
<ASSETS-OTHER>                                    2827
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                16700751
<PAYABLE-FOR-SECURITIES>                        129433
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       245127
<TOTAL-LIABILITIES>                             374560
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      11228831
<SHARES-COMMON-STOCK>                           108160
<SHARES-COMMON-PRIOR>                            89179
<ACCUMULATED-NII-CURRENT>                         5602
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                          68559
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       5023199
<NET-ASSETS>                                   3283302
<DIVIDEND-INCOME>                                81525
<INTEREST-INCOME>                                11887
<OTHER-INCOME>                                    1895
<EXPENSES-NET>                                   12185
<NET-INVESTMENT-INCOME>                          83122
<REALIZED-GAINS-CURRENT>                        100005
<APPREC-INCREASE-CURRENT>                      1404074
<NET-CHANGE-FROM-OPS>                          1587201
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        16410
<DISTRIBUTIONS-OF-GAINS>                         14449
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          24881
<NUMBER-OF-SHARES-REDEEMED>                       6856
<SHARES-REINVESTED>                                956
<NET-CHANGE-IN-ASSETS>                         4573072
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                        41321
<OVERDISTRIB-NII-PRIOR>                            242
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                               69
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                  12206
<AVERAGE-NET-ASSETS>                           2773737
<PER-SHARE-NAV-BEGIN>                            27.42
<PER-SHARE-NII>                                  0.177
<PER-SHARE-GAIN-APPREC>                          3.080
<PER-SHARE-DIVIDEND>                             0.162
<PER-SHARE-DISTRIBUTIONS>                        0.155
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              30.36
<EXPENSE-RATIO>                                   0.10
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000036405
<NAME> VANGUARD INDEX FUNDS
<SERIES>
   <NUMBER> 041
   <NAME> VANGUARD VALUE INDEX FUND - INVESTOR SHARES
<MULTIPLIER> 1000
<CURRENCY> US

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               JUN-30-1999
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                          2861430
<INVESTMENTS-AT-VALUE>                         3576601
<RECEIVABLES>                                   597006
<ASSETS-OTHER>                                     504
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                 4174111
<PAYABLE-FOR-SECURITIES>                        582192
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                         5329
<TOTAL-LIABILITIES>                             587521
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                       2684299
<SHARES-COMMON-STOCK>                           130348
<SHARES-COMMON-PRIOR>                           107548
<ACCUMULATED-NII-CURRENT>                         2064
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                         185051
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                        715176
<NET-ASSETS>                                   3214280
<DIVIDEND-INCOME>                                26902
<INTEREST-INCOME>                                  247
<OTHER-INCOME>                                      39
<EXPENSES-NET>                                    3104
<NET-INVESTMENT-INCOME>                          24084
<REALIZED-GAINS-CURRENT>                        191024
<APPREC-INCREASE-CURRENT>                       170272
<NET-CHANGE-FROM-OPS>                           385380
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        19393
<DISTRIBUTIONS-OF-GAINS>                         79931
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          34730
<NUMBER-OF-SHARES-REDEEMED>                      15956
<SHARES-REINVESTED>                               4026
<NET-CHANGE-IN-ASSETS>                          979877
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                        80108
<OVERDISTRIB-NII-PRIOR>                            551
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                               34
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                   3104
<AVERAGE-NET-ASSETS>                           2719151
<PER-SHARE-NAV-BEGIN>                            22.51
<PER-SHARE-NII>                                  0.173
<PER-SHARE-GAIN-APPREC>                          2.857
<PER-SHARE-DIVIDEND>                              0.16
<PER-SHARE-DISTRIBUTIONS>                         0.72
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              24.66
<EXPENSE-RATIO>                                   0.22
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000036405
<NAME> VANGUARD INDEX FUNDS
<SERIES>
   <NUMBER> 042
   <NAME> VANGUARD VALUE INDEX FUND - INSTITUTIONAL SHARES
<MULTIPLIER> 1000
<CURRENCY> US

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               JUN-30-1999
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                          2861430
<INVESTMENTS-AT-VALUE>                         3576601
<RECEIVABLES>                                   597006
<ASSETS-OTHER>                                     504
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                 4174111
<PAYABLE-FOR-SECURITIES>                        582192
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                         5329
<TOTAL-LIABILITIES>                             587521
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                       2684299
<SHARES-COMMON-STOCK>                            15098
<SHARES-COMMON-PRIOR>                             8269
<ACCUMULATED-NII-CURRENT>                         2064
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                         185051
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                        715176
<NET-ASSETS>                                    372310
<DIVIDEND-INCOME>                                26902
<INTEREST-INCOME>                                  247
<OTHER-INCOME>                                      39
<EXPENSES-NET>                                    3104
<NET-INVESTMENT-INCOME>                          24084
<REALIZED-GAINS-CURRENT>                        191024
<APPREC-INCREASE-CURRENT>                       170272
<NET-CHANGE-FROM-OPS>                           385380
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                         2076
<DISTRIBUTIONS-OF-GAINS>                          6150
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                           6529
<NUMBER-OF-SHARES-REDEEMED>                         56
<SHARES-REINVESTED>                                356
<NET-CHANGE-IN-ASSETS>                          979877
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                        80108
<OVERDISTRIB-NII-PRIOR>                            551
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                               34
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                   3104
<AVERAGE-NET-ASSETS>                            243764
<PER-SHARE-NAV-BEGIN>                            22.51
<PER-SHARE-NII>                                  0.183
<PER-SHARE-GAIN-APPREC>                          2.857
<PER-SHARE-DIVIDEND>                             0.170
<PER-SHARE-DISTRIBUTIONS>                        0.720
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              24.66
<EXPENSE-RATIO>                                   0.12
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000036405
<NAME> VANGUARD INDEX FUNDS
<SERIES>
   <NUMBER> 051
   <NAME> VANGUARD GROWTH INDEX FUND - INVESTOR SHARES
<MULTIPLIER> 1000
<CURRENCY> US

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               JUN-30-1999
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                          9109031
<INVESTMENTS-AT-VALUE>                        11702368
<RECEIVABLES>                                  1812429
<ASSETS-OTHER>                                    3600
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<TOTAL-ASSETS>                                13518397
<PAYABLE-FOR-SECURITIES>                       1808394
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                        18669
<TOTAL-LIABILITIES>                            1827063
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                       8788823
<SHARES-COMMON-STOCK>                           326187
<SHARES-COMMON-PRIOR>                           209802
<ACCUMULATED-NII-CURRENT>                          363
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<ACCUMULATED-NET-GAINS>                         308752
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       2593396
<NET-ASSETS>                                  11391361
<DIVIDEND-INCOME>                                43852
<INTEREST-INCOME>                                 1105
<OTHER-INCOME>                                      78
<EXPENSES-NET>                                   10337
<NET-INVESTMENT-INCOME>                          34698
<REALIZED-GAINS-CURRENT>                        309469
<APPREC-INCREASE-CURRENT>                       641931
<NET-CHANGE-FROM-OPS>                           986098
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        33664
<DISTRIBUTIONS-OF-GAINS>                         38237
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<NUMBER-OF-SHARES-SOLD>                         146918
<NUMBER-OF-SHARES-REDEEMED>                      32545
<SHARES-REINVESTED>                               2012
<NET-CHANGE-IN-ASSETS>                         4822834
<ACCUMULATED-NII-PRIOR>                            374
<ACCUMULATED-GAINS-PRIOR>                        38663
<OVERDISTRIB-NII-PRIOR>                              0
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<GROSS-ADVISORY-FEES>                               34
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                  10337
<AVERAGE-NET-ASSETS>                           9301003
<PER-SHARE-NAV-BEGIN>                            31.67
<PER-SHARE-NII>                                  0.105
<PER-SHARE-GAIN-APPREC>                          3.390
<PER-SHARE-DIVIDEND>                             0.110
<PER-SHARE-DISTRIBUTIONS>                        0.135
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              34.92
<EXPENSE-RATIO>                                   0.22
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000036405
<NAME> VANGUARD INDEX FUNDS
<SERIES>
   <NUMBER> 052
   <NAME> VANGUARD GROWTH INDEX FUND - INSTITUTIONAL SHARES
<MULTIPLIER> 1000
<CURRENCY> US

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               JUN-30-1999
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                          9109031
<INVESTMENTS-AT-VALUE>                        11702368
<RECEIVABLES>                                  1812429
<ASSETS-OTHER>                                    3600
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                13518397
<PAYABLE-FOR-SECURITIES>                       1808394
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<SHARES-COMMON-PRIOR>                             7079
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<NET-INVESTMENT-INCOME>                          34698
<REALIZED-GAINS-CURRENT>                        309469
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<NUMBER-OF-SHARES-SOLD>                           3837
<NUMBER-OF-SHARES-REDEEMED>                       2394
<SHARES-REINVESTED>                                 66
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<ACCUMULATED-NII-PRIOR>                            374
<ACCUMULATED-GAINS-PRIOR>                        38663
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<INTEREST-EXPENSE>                                   0
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<PER-SHARE-NAV-BEGIN>                            31.67
<PER-SHARE-NII>                                  0.128
<PER-SHARE-GAIN-APPREC>                          3.390
<PER-SHARE-DIVIDEND>                             0.123
<PER-SHARE-DISTRIBUTIONS>                        0.135
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              34.93
<EXPENSE-RATIO>                                   0.12
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000036405
<NAME> VANGUARD INDEX FUNDS
<SERIES>
   <NUMBER> 061
   <NAME> VANGUARD SMALL-CAP INDEX FUND-INVESTOR SHARES
<MULTIPLIER> 1000
<CURRENCY> US

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               JUN-30-1999
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                          3120835
<INVESTMENTS-AT-VALUE>                         3441681
<RECEIVABLES>                                   235427
<ASSETS-OTHER>                                     994
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<TOTAL-ASSETS>                                 3678102
<PAYABLE-FOR-SECURITIES>                        222482
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       110411
<TOTAL-LIABILITIES>                             332893
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                       2794716
<SHARES-COMMON-STOCK>                           132301
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<DISTRIBUTIONS-OF-GAINS>                         20675
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<NUMBER-OF-SHARES-SOLD>                          24551
<NUMBER-OF-SHARES-REDEEMED>                      23877
<SHARES-REINVESTED>                               1040
<NET-CHANGE-IN-ASSETS>                          312853
<ACCUMULATED-NII-PRIOR>                              0
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<OVERDISTRIB-NII-PRIOR>                            641
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<PER-SHARE-NAV-BEGIN>                            21.20
<PER-SHARE-NII>                                  0.130
<PER-SHARE-GAIN-APPREC>                          2.080
<PER-SHARE-DIVIDEND>                             0.010
<PER-SHARE-DISTRIBUTIONS>                        0.160
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              23.24
<EXPENSE-RATIO>                                   0.24
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000036405
<NAME> VANGUARD INDEX FUNDS
<SERIES>
   <NUMBER> 062
   <NAME> VANGUARD SMALL-CAP INDEX FUND-INSTITUTIONAL SHARES
<MULTIPLIER> 1000
<CURRENCY> US

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               JUN-30-1999
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                          3120835
<INVESTMENTS-AT-VALUE>                         3441681
<RECEIVABLES>                                   235427
<ASSETS-OTHER>                                     994
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<TOTAL-ASSETS>                                 3678102
<PAYABLE-FOR-SECURITIES>                        222482
<SENIOR-LONG-TERM-DEBT>                              0
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<TOTAL-LIABILITIES>                             332893
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                       2794716
<SHARES-COMMON-STOCK>                            11658
<SHARES-COMMON-PRIOR>                            12467
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<OVERDISTRIBUTION-NII>                               0
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<DISTRIBUTIONS-OF-GAINS>                          1661
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<NUMBER-OF-SHARES-SOLD>                           3429
<NUMBER-OF-SHARES-REDEEMED>                       4317
<SHARES-REINVESTED>                                 79
<NET-CHANGE-IN-ASSETS>                          312853
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<OVERDISTRIB-NII-PRIOR>                            641
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<PER-SHARE-NII>                                  0.140
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<EXPENSE-RATIO>                                   0.12
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000036405
<NAME> VANGUARD INDEX FUNDS
<SERIES>
   <NUMBER> 071
   <NAME> VANGUARD MID-CAP INDEX FUND-INVESTOR SHARES
<MULTIPLIER> 1000
<CURRENCY> US

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               JUN-30-1999
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                           446391
<INVESTMENTS-AT-VALUE>                          478482
<RECEIVABLES>                                    13230
<ASSETS-OTHER>                                      63
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<PAYABLE-FOR-SECURITIES>                         13750
<SENIOR-LONG-TERM-DEBT>                              0
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<TOTAL-LIABILITIES>                              15820
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        433406
<SHARES-COMMON-STOCK>                            35676
<SHARES-COMMON-PRIOR>                            19066
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<REALIZED-GAINS-CURRENT>                          9188
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<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                         12978
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          19439
<NUMBER-OF-SHARES-REDEEMED>                       4111
<SHARES-REINVESTED>                               1282
<NET-CHANGE-IN-ASSETS>                          231610
<ACCUMULATED-NII-PRIOR>                              0
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<OVERDISTRIB-NII-PRIOR>                             29
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<INTEREST-EXPENSE>                                   0
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<PER-SHARE-NAV-BEGIN>                            10.79
<PER-SHARE-NII>                                  0.039
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<EXPENSE-RATIO>                                   0.25
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000036405
<NAME> VANGUARD INDEX FUNDS
<SERIES>
   <NUMBER> 072
   <NAME> VANGUARD MID-CAP INDEX FUND-INSTITUTIONAL SHARES
<MULTIPLIER> 1000
<CURRENCY> US

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               JUN-30-1999
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                           446391
<INVESTMENTS-AT-VALUE>                          478482
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<PAYABLE-FOR-SECURITIES>                         13750
<SENIOR-LONG-TERM-DEBT>                              0
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<TOTAL-LIABILITIES>                              15820
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        433406
<SHARES-COMMON-STOCK>                             7702
<SHARES-COMMON-PRIOR>                             3586
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<NUMBER-OF-SHARES-SOLD>                           3927
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                                189
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<PER-SHARE-NAV-BEGIN>                            10.79
<PER-SHARE-NII>                                  0.049
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<PER-SHARE-DISTRIBUTIONS>                        0.510
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<PER-SHARE-NAV-END>                              10.98
<EXPENSE-RATIO>                                   0.12
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000036405
<NAME> VANGUARD INDEX FUNDS
<SERIES>
   <NUMBER> 081
   <NAME> VANGUARD SMALL-CAP VALUE INDEX FUND-INVESTOR SHARES
<MULTIPLIER> 1000
<CURRENCY> US

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
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<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                           188245
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<NUMBER-OF-SHARES-REDEEMED>                       2436
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<EXPENSE-RATIO>                                   0.25
[AVG-DEBT-OUTSTANDING]                               0
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</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000036405
<NAME> VANGUARD INDEX FUNDS
<SERIES>
   <NUMBER> 091
   <NAME> VANGUARD SMALL-CAP GROWTH INDEX FUND-INVESTOR SHARES
<MULTIPLIER> 1000
<CURRENCY> US

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
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<REALIZED-GAINS-CURRENT>                         (568)
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<ACCUMULATED-GAINS-PRIOR>                       (5567)
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<EXPENSE-RATIO>                                   0.25
[AVG-DEBT-OUTSTANDING]                               0
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</TABLE>


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