<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
FINANCIAL STATEMENTS FOR SIX MONTHS ENDED JUNE 30, 2000 AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000022698
<NAME> COMSAT Corporation
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> JUN-30-2000
<CASH> 57,555
<SECURITIES> 0
<RECEIVABLES> 145,801
<ALLOWANCES> 0
<INVENTORY> 0
<CURRENT-ASSETS> 222,580
<PP&E> 2,237,834
<DEPRECIATION> 1,298,733
<TOTAL-ASSETS> 1,650,855
<CURRENT-LIABILITIES> 204,824
<BONDS> 339,549
0
0
<COMMON> 452,841
<OTHER-SE> 170,027
<TOTAL-LIABILITY-AND-EQUITY> 1,650,855
<SALES> 0
<TOTAL-REVENUES> 340,164
<CGS> 0
<TOTAL-COSTS> 187,768
<OTHER-EXPENSES> 98,929
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 17,416
<INCOME-PRETAX> 27,587
<INCOME-TAX> 17,879
<INCOME-CONTINUING> 27,587
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 27,587
<EPS-BASIC> 0.52
<EPS-DILUTED> 0.52
</TABLE>