<ARTICLE>                                                                 9
<LEGEND>   THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED
FROM THE UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS OF CHEMICAL FINANCIAL
CORPORATION AND SUBSIDIARIES FOR THE PERIOD ENDED SEPTEMBER 30, 1997 AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER>                                                          1,000
       
                                                            
<PERIOD-TYPE>                                                         9-MOS
<FISCAL-YEAR-END>                                               DEC-31-1997
<PERIOD-START>                                                  JAN-01-1997
<PERIOD-END>                                                    SEP-30-1997
<CASH>                                                               77,504
<INT-BEARING-DEPOSITS>                                                    0
<FED-FUNDS-SOLD>                                                     62,950
<TRADING-ASSETS>                                                          0
<INVESTMENTS-HELD-FOR-SALE>                                         478,981
<INVESTMENTS-CARRYING>                                              260,197
<INVESTMENTS-MARKET>                                                262,297
<LOANS>                                                             839,624
<ALLOWANCE>                                                          17,269
<TOTAL-ASSETS>                                                    1,748,824
<DEPOSITS>                                                        1,459,175
<SHORT-TERM>                                                         47,050
<LIABILITIES-OTHER>                                                  14,704
<LONG-TERM>                                                           9,000
<COMMON>                                                            102,263
<PREFERRED-MANDATORY>                                                     0
<PREFERRED>                                                               0
<OTHER-SE>                                                          116,632
<TOTAL-LIABILITIES-AND-EQUITY>                                    1,748,824
<INTEREST-LOAN>                                                      51,857
<INTEREST-INVEST>                                                    31,763
<INTEREST-OTHER>                                                      3,800
<INTEREST-TOTAL>                                                     87,420
<INTEREST-DEPOSIT>                                                   34,455
<INTEREST-EXPENSE>                                                   35,890
<INTEREST-INCOME-NET>                                                51,530
<LOAN-LOSSES>                                                           767
<SECURITIES-GAINS>                                                        1
<EXPENSE-OTHER>                                                      35,084
<INCOME-PRETAX>                                                      25,349
<INCOME-PRE-EXTRAORDINARY>                                           25,349
<EXTRAORDINARY>                                                           0
<CHANGES>                                                                 0
<NET-INCOME>                                                         17,056
<EPS-PRIMARY>                                                          1.65
<EPS-DILUTED>                                                          1.64
<YIELD-ACTUAL>                                                         4.35
<LOANS-NON>                                                           1,870
<LOANS-PAST>                                                          1,691
<LOANS-TROUBLED>                                                          6
<LOANS-PROBLEM>                                                       3,567
<ALLOWANCE-OPEN>                                                     16,607
<CHARGE-OFFS>                                                           394
<RECOVERIES>                                                            289
<ALLOWANCE-CLOSE>                                                    17,269
<ALLOWANCE-DOMESTIC>                                                 17,269
<ALLOWANCE-FOREIGN>                                                       0
<ALLOWANCE-UNALLOCATED>                                                   0