CALVERT TAX FREE RESERVES
NSAR-B, 2000-02-23
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<PAGE>      PAGE  1
000 B000000 12/31/1999
000 C000000 0000319676
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
000 J000000 A
001 A000000 CALVERT TAX-FREE RESERVES
001 B000000 811-3101
001 C000000 3019514881
002 A000000 4550 MONTGOMERY AVENUE SUITE 1000N
002 B000000 BETHESDA
002 C000000 MD
002 D010000 20814
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 Y
007 B000000  5
007 C010100  1
007 C020100 MONEY MARKET PORTFOLIO
007 C030100 N
007 C010200  2
007 C020200 LIMITED TERM PORTFOLIO
007 C030200 N
007 C010300  3
007 C020300 LONG TERM PORTFOLIO
007 C030300 N
007 C010400  4
007 C020400 CALIFORNIA MONEY MARKET FUND
007 C030400 N
007 C010500  5
007 C020500 VERMONT MUNICIPAL PORTYFOLIO
007 C030500 N
007 C010600  6
007 C010700  7
007 C010800  8
007 C010900  9
007 C011000 10
007 C011100 11
007 C011200 12
007 C011300 13
007 C011400 14
007 C011500 15
007 C011600 16
007 C011700 17
007 C011800 18
007 C011900 19
<PAGE>      PAGE  2
007 C012000 20
018  00AA00 Y
019 A00AA00 Y
019 B00AA00   29
019 C00AA00 CALVERTGRP
020 C000001      0
020 C000002      0
020 C000003      0
020 C000004      0
020 C000005      0
020 C000006      0
020 C000007      0
020 C000008      0
020 C000009      0
020 C000010      0
021  000000        0
022 A000001 LWHMAN BROS INC
022 C000001   1543794
022 D000001    769160
022 A000002 MERRILL LYNCH PIERCE FENNER & SMITH
022 C000002    638484
022 D000002    747208
022 A000003 PIPER JAFFRAY INC
022 C000003    394194
022 D000003    325584
022 A000004 MORGAN KEEGAN & CO INC
022 C000004    392917
022 D000004    313969
022 A000005 BEAR STEARNS SECURITIES CORP
022 C000005    417067
022 D000005    255171
022 A000006 FIRST CHICAGO CAPITAL MARKETS INC
022 C000006    331180
022 D000006    315132
022 A000007 BT ALEX BROWN INC
022 C000007    181834
022 D000007    144825
022 A000008 FIRST COMMERCE CAPITAL
022 C000008    177761
022 D000008    218500
022 A000009 BANK OF AMERICA
022 C000009    171761
022 D000009    217523
022 A000010 SALOMON SMITH BARNEY INC
022 C000010    113284
022 D000010    324606
023 C000000 7247803627
023 D000000 7326693833
024  00AA00 N
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025 D00AA02       0
<PAGE>      PAGE  3
025 D00AA03       0
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025 D00AA07       0
025 D00AA08       0
026 A000000 N
026 B000000 N
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058 A00AA00 N
059  00AA00 Y
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061  00AA00     2000
066 A00AA00 N
067  00AA00 N
068 A00AA00 N
068 B00AA00 N
069  00AA00 N
077 A000000 Y
077 B000000 Y
078  000000 N
080 A00AA00 ICI MUTUAL INSURANCE COMPANY
080 C00AA00     9000
081 A00AA00 Y
081 B00AA00  38
082 A00AA00 N
082 B00AA00        0
083 A00AA00 N
083 B00AA00        0
084 A00AA00 N
084 B00AA00        0
085 A00AA00 Y
085 B00AA00 N
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086 A02AA00      0
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<PAGE>      PAGE  4
086 F01AA00      0
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<PAGE>      PAGE  5
042 H000100   0
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050  000100 N
051  000100 N
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<PAGE>      PAGE  6
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<PAGE>      PAGE  7
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<PAGE>      PAGE  8
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030 B000200  2.75
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<PAGE>      PAGE  9
033  000200     12
037  000200 N
038  000200      0
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042 C000200   0
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042 E000200  25
042 F000200   0
042 G000200   0
042 H000200   0
043  000200    168
044  000200      0
045  000200 Y
046  000200 N
047  000200 Y
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048 A020200 0.600
048 B010200      500
048 B020200 0.500
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048 F020200 0.000
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048 G020200 0.000
048 H010200        0
048 H020200 0.000
048 I010200        0
048 I020200 0.000
048 J010200        0
048 J020200 0.000
048 K010200     1000
048 K020200 0.400
049  000200 N
050  000200 N
051  000200 N
052  000200 N
053 A000200 N
055 A000200 N
055 B000200 N
056  000200 N
057  000200 N
062 A000200 Y
062 B000200   0.0
<PAGE>      PAGE  10
062 C000200   0.0
062 D000200   0.0
062 E000200  27.5
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062 H000200   0.0
062 I000200   0.0
062 J000200   0.0
062 K000200   0.0
062 L000200   0.0
062 M000200   0.0
062 N000200   0.0
062 O000200  72.4
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062 Q000200   0.0
062 R000200   0.0
063 A000200   0
063 B000200  1.0
070 A010200 Y
070 A020200 Y
070 B010200 N
070 B020200 N
070 C010200 N
070 C020200 N
070 D010200 N
070 D020200 N
070 E010200 N
070 E020200 N
070 F010200 N
070 F020200 N
070 G010200 N
070 G020200 N
070 H010200 N
070 H020200 N
070 I010200 N
070 I020200 N
070 J010200 N
070 J020200 N
070 K010200 N
070 K020200 N
070 L010200 N
070 L020200 N
070 M010200 N
070 M020200 N
070 N010200 N
070 N020200 N
070 O010200 N
070 O020200 N
070 P010200 N
070 P020200 N
070 Q010200 N
<PAGE>      PAGE  11
070 Q020200 N
070 R010200 N
070 R020200 N
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<PAGE>      PAGE  12
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074 U010200    49238
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028 F010300        50
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028 F040300      1275
028 G010300      1276
<PAGE>      PAGE  13
028 G020300      1030
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028 H000300        33
029  000300 Y
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030 B000300  2.75
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033  000300      7
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045  000300 Y
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048 K020300 0.400
<PAGE>      PAGE  14
049  000300 N
050  000300 N
051  000300 N
052  000300 N
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062 E000300  17.3
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070 A010300 Y
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070 D020300 N
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070 E020300 Y
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070 F020300 N
070 G010300 N
070 G020300 N
070 H010300 N
070 H020300 N
070 I010300 N
070 I020300 N
070 J010300 N
070 J020300 N
070 K010300 N
070 K020300 N
<PAGE>      PAGE  15
070 L010300 N
070 L020300 N
070 M010300 N
070 M020300 N
070 N010300 N
070 N020300 N
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070 O020300 N
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070 P020300 N
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070 Q020300 N
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<PAGE>      PAGE  16
073 A010300   0.7010
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074 D000300    41549
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074 U010300     3344
074 U020300        0
074 V010300    15.30
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028 D010400     24394
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<PAGE>      PAGE  17
028 D030400         0
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045  000400 Y
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<PAGE>      PAGE  18
048 F020400 0.000
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049  000400 N
050  000400 N
051  000400 N
052  000400 N
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057  000400 N
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<PAGE>      PAGE  19
070 F020400 N
070 G010400 N
070 G020400 N
070 H010400 N
070 H020400 N
070 I010400 N
070 I020400 N
070 J010400 N
070 J020400 N
070 K010400 N
070 K020400 N
070 L010400 N
070 L020400 N
070 M010400 N
070 M020400 N
070 N010400 N
070 N020400 N
070 O010400 N
070 O020400 N
070 P010400 N
070 P020400 N
070 Q010400 N
070 Q020400 N
070 R010400 N
070 R020400 N
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<PAGE>      PAGE  20
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028 A010500       186
028 A020500       104
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<PAGE>      PAGE  21
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028 D040500       555
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028 E020500        91
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028 E040500      1077
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028 F020500        95
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028 F040500      1449
028 G010500      1643
028 G020500       583
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028 G040500      5399
028 H000500      2226
029  000500 N
030 A000500      0
030 B000500  0.00
030 C000500  0.00
031 A000500      0
031 B000500      0
032  000500      0
033  000500      0
037  000500 N
038  000500      0
040  000500 N
041  000500 N
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042 B000500   0
042 C000500   0
042 D000500   0
042 E000500   0
042 F000500   0
042 G000500   0
042 H000500   0
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045  000500 Y
046  000500 N
047  000500 Y
<PAGE>      PAGE  22
048  000500  0.000
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048 I020500 0.000
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048 K010500     1000
048 K020500 0.400
049  000500 N
050  000500 N
051  000500 N
052  000500 N
053 A000500 Y
055 A000500 N
055 B000500 N
056  000500 N
057  000500 N
062 A000500 Y
062 B000500   0.0
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062 D000500   0.0
062 E000500   2.0
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062 I000500   0.0
062 J000500   0.0
062 K000500   0.0
062 L000500   0.0
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062 O000500  98.1
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062 Q000500   0.0
062 R000500   0.0
063 A000500   0
<PAGE>      PAGE  23
063 B000500 14.0
070 A010500 Y
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070 B020500 N
070 C010500 N
070 C020500 N
070 D010500 N
070 D020500 N
070 E010500 N
070 E020500 N
070 F010500 N
070 F020500 N
070 G010500 N
070 G020500 N
070 H010500 N
070 H020500 N
070 I010500 N
070 I020500 N
070 J010500 N
070 J020500 N
070 K010500 N
070 K020500 N
070 L010500 N
070 L020500 N
070 M010500 N
070 M020500 N
070 N010500 N
070 N020500 N
070 O010500 N
070 O020500 N
070 P010500 N
070 P020500 N
070 Q010500 N
070 Q020500 N
070 R010500 N
070 R020500 N
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<PAGE>      PAGE  24
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073 A010500   0.7000
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<PAGE>      PAGE  25
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028 A010600       313
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029  000600 N
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031 A000600      0
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034  000600 N
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037  000600 N
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<PAGE>      PAGE  26
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050  000600 N
051  000600 N
052  000600 N
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<PAGE>      PAGE  27
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070 J020600 N
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070 L020600 N
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<PAGE>      PAGE  28
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<PAGE>      PAGE  29
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SIGNATURE   WILLIAM TARTIKOFF
TITLE       GENERAL COUNSEL


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000319676
<NAME> CALVERT TAX-FREE RESERVES
<SERIES>
   <NUMBER> 311
   <NAME> MONEY MARKET PORTFOLIO, CLASS O
<MULTIPLIER> 1000

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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000319676
<NAME> CALVERT TAX-FREE RESERVES
<SERIES>
   <NUMBER> 322
   <NAME> MONEY MARKET PORTFOLIO, INSTITUTIONAL CLASS
<MULTIPLIER> 1000

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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000319676
<NAME> CALVERT TAX-FREE RESERVES
<SERIES>
   <NUMBER> 333
   <NAME> MONEY MARKET PORTFOLIO, CLASS T
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</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000319676
<NAME> CALVERT TAX-FREE RESERVES
<SERIES>
   <NUMBER> 344
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

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

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<NAME> CALVERT TAX-FREE RESERVES
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

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