<TABLE> <S> <C>

<ARTICLE>           9
<LEGEND>
THE SCHEDULE BELOW CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED FINANCIAL STATEMENTS OF ALLEGIANT BANCORP, INC. FILED AS PART
OF THE COMPANY'S QUARTERLY REPORT ON FORM 10-Q FOR THE QUARTER ENDED
MARCH 31, 1999.
</LEGEND>
       
<PERIOD-TYPE>                    3-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               MAR-31-1999
<S>                                        <C>
<CASH>                                      12,855,000
<INT-BEARING-DEPOSITS>                      42,941,000
<FED-FUNDS-SOLD>                             4,475,000
<TRADING-ASSETS>                            55,927,000
<INVESTMENTS-HELD-FOR-SALE>                 45,075,000
<INVESTMENTS-CARRYING>                      10,852,000
<INVESTMENTS-MARKET>                        10,927,000
<LOANS>                                    520,306,000
<ALLOWANCE>                                  6,767,000
<TOTAL-ASSETS>                             620,857,000
<DEPOSITS>                                 481,038,000
<SHORT-TERM>                                47,039,000
<LIABILITIES-OTHER>                          3,446,000
<LONG-TERM>                                 40,275,000
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        65,000
<OTHER-SE>                                  48,994,000
<TOTAL-LIABILITIES-AND-EQUITY>             620,857,000
<INTEREST-LOAN>                             11,073,000
<INTEREST-INVEST>                              773,000
<INTEREST-OTHER>                                79,000
<INTEREST-TOTAL>                            11,925,000
<INTEREST-DEPOSIT>                           4,856,000
<INTEREST-EXPENSE>                           6,088,000
<INTEREST-INCOME-NET>                        5,837,000
<LOAN-LOSSES>                                  562,000
<SECURITIES-GAINS>                                   0
<EXPENSE-OTHER>                              4,858,000
<INCOME-PRETAX>                              1,671,000
<INCOME-PRE-EXTRAORDINARY>                   1,002,000
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                 1,002,000
<EPS-PRIMARY>                                    0.153
<EPS-DILUTED>                                    0.150
<YIELD-ACTUAL>                                    8.53
<LOANS-NON>                                  1,514,000
<LOANS-PAST>                                   396,000
<LOANS-TROUBLED>                                     0
<LOANS-PROBLEM>                                      0
<ALLOWANCE-OPEN>                             6,442,000
<CHARGE-OFFS>                                  240,000
<RECOVERIES>                                     3,000
<ALLOWANCE-CLOSE>                            6,767,000
<ALLOWANCE-DOMESTIC>                                 0
<ALLOWANCE-FOREIGN>                                  0
<ALLOWANCE-UNALLOCATED>                              0
        

</TABLE>