<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 9
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM
BROAD NATIONAL BANCORPORATION'S FORM 10-Q FOR THE QUARTER ENDED
SEPTEMBER 30, 1998 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               SEP-30-1998
<CASH>                                          19,551
<INT-BEARING-DEPOSITS>                               0
<FED-FUNDS-SOLD>                                11,955
<TRADING-ASSETS>                                     0
<INVESTMENTS-HELD-FOR-SALE>                    188,769
<INVESTMENTS-CARRYING>                          39,075
<INVESTMENTS-MARKET>                            39,546
<LOANS>                                        348,689
<ALLOWANCE>                                      7,925
<TOTAL-ASSETS>                                 622,276
<DEPOSITS>                                     540,990
<SHORT-TERM>                                    13,775
<LIABILITIES-OTHER>                             11,880
<LONG-TERM>                                          0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                         4,961
<OTHER-SE>                                      39,170
<TOTAL-LIABILITIES-AND-EQUITY>                 622,276
<INTEREST-LOAN>                                 22,457
<INTEREST-INVEST>                               10,081
<INTEREST-OTHER>                                 1,621
<INTEREST-TOTAL>                                34,159
<INTEREST-DEPOSIT>                              12,141
<INTEREST-EXPENSE>                              13,795
<INTEREST-INCOME-NET>                           20,364
<LOAN-LOSSES>                                      750
<SECURITIES-GAINS>                                  26
<EXPENSE-OTHER>                                 16,183
<INCOME-PRETAX>                                  9,033
<INCOME-PRE-EXTRAORDINARY>                       9,033
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     5,720
<EPS-PRIMARY>                                     1.22
<EPS-DILUTED>                                     1.16
<YIELD-ACTUAL>                                    4.63
<LOANS-NON>                                      2,628
<LOANS-PAST>                                     1,388
<LOANS-TROUBLED>                                 1,603
<LOANS-PROBLEM>                                  3,859
<ALLOWANCE-OPEN>                                 6,974
<CHARGE-OFFS>                                      890
<RECOVERIES>                                     1,091
<ALLOWANCE-CLOSE>                                7,925
<ALLOWANCE-DOMESTIC>                             7,925
<ALLOWANCE-FOREIGN>                                  0
<ALLOWANCE-UNALLOCATED>                          6,399
        

</TABLE>