<TABLE> <S> <C>

<PAGE>
<ARTICLE> 9
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM PATAPSCO
BANCORP, INC. AND SUBSIDIARY AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO
SUCH FINANCIAL STATEMENTS.
</LEGEND>
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   9-MOS                   3-MOS
<FISCAL-YEAR-END>                          JUN-30-1998             JUN-30-1998
<PERIOD-START>                             JUL-01-1997             JUL-01-1997
<PERIOD-END>                               MAR-31-1998             MAR-31-1998
<CASH>                                         849,669                 849,669
<INT-BEARING-DEPOSITS>                         376,866                 376,866
<FED-FUNDS-SOLD>                             6,634,567               6,634,567
<TRADING-ASSETS>                                     0                       0
<INVESTMENTS-HELD-FOR-SALE>                  5,128,181               5,128,181
<INVESTMENTS-CARRYING>                       5,128,181               5,128,181
<INVESTMENTS-MARKET>                         5,128,181               5,128,181
<LOANS>                                     75,371,472              75,371,472
<ALLOWANCE>                                    525,362                 525,362
<TOTAL-ASSETS>                              90,803,725              90,803,725
<DEPOSITS>                                  69,690,898              69,690,898
<SHORT-TERM>                                 1,800,000               1,800,000
<LIABILITIES-OTHER>                          2,076,450               2,076,450
<LONG-TERM>                                  8,400,000               8,400,000
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                         3,626                   3,626
<OTHER-SE>                                   8,832,751               8,832,751
<TOTAL-LIABILITIES-AND-EQUITY>              90,803,725              90,803,725
<INTEREST-LOAN>                              4,537,938               1,565,461
<INTEREST-INVEST>                              428,247                  83,840
<INTEREST-OTHER>                               255,012                 110,780
<INTEREST-TOTAL>                             5,221,197               1,760,081
<INTEREST-DEPOSIT>                           2,130,388                 705,337
<INTEREST-EXPENSE>                           2,578,923                 860,575
<INTEREST-INCOME-NET>                        2,642,274                 899,506
<LOAN-LOSSES>                                  180,000                  60,000
<SECURITIES-GAINS>                               5,015                       0
<EXPENSE-OTHER>                              1,876,490                 617,264
<INCOME-PRETAX>                                790,680                 285,473
<INCOME-PRE-EXTRAORDINARY>                     790,680                 285,473
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                   497,799                 178,535
<EPS-PRIMARY>                                     1.47                    0.53
<EPS-DILUTED>                                     1.47                    0.53
<YIELD-ACTUAL>                                    8.07                    8.12
<LOANS-NON>                                    342,000                 342,000
<LOANS-PAST>                                   342,000                 342,000
<LOANS-TROUBLED>                                     0                       0
<LOANS-PROBLEM>                                      0                       0
<ALLOWANCE-OPEN>                               397,012                 495,309
<CHARGE-OFFS>                                   57,467                  31,666
<RECOVERIES>                                     5,817                   1,719
<ALLOWANCE-CLOSE>                              525,362                 525,362
<ALLOWANCE-DOMESTIC>                                 0                       0
<ALLOWANCE-FOREIGN>                                  0                       0
<ALLOWANCE-UNALLOCATED>                              0                       0
        

</TABLE>