<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, 1998 AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER>                                                          1,000
       
                                                            
<PERIOD-TYPE>                                                         9-MOS
<FISCAL-YEAR-END>                                               DEC-31-1998
<PERIOD-START>                                                  JAN-01-1998
<PERIOD-END>                                                    SEP-30-1998
<CASH>                                                               78,588
<INT-BEARING-DEPOSITS>                                                5,000
<FED-FUNDS-SOLD>                                                     90,650
<TRADING-ASSETS>                                                          0
<INVESTMENTS-HELD-FOR-SALE>                                         506,656
<INVESTMENTS-CARRYING>                                              217,935
<INVESTMENTS-MARKET>                                                222,269
<LOANS>                                                             891,206
<ALLOWANCE>                                                          17,969
<TOTAL-ASSETS>                                                    1,815,601
<DEPOSITS>                                                        1,499,694
<SHORT-TERM>                                                         53,040
<LIABILITIES-OTHER>                                                  15,905
<LONG-TERM>                                                           9,000
<COMMON>                                                             10,795
<PREFERRED-MANDATORY>                                                     0
<PREFERRED>                                                               0
<OTHER-SE>                                                          227,167
<TOTAL-LIABILITIES-AND-EQUITY>                                    1,815,601
<INTEREST-LOAN>                                                      55,286
<INTEREST-INVEST>                                                    32,153
<INTEREST-OTHER>                                                      3,621
<INTEREST-TOTAL>                                                     91,060
<INTEREST-DEPOSIT>                                                   35,709
<INTEREST-EXPENSE>                                                   37,286
<INTEREST-INCOME-NET>                                                53,774
<LOAN-LOSSES>                                                           713
<SECURITIES-GAINS>                                                        0
<EXPENSE-OTHER>                                                      36,942
<INCOME-PRETAX>                                                      27,566
<INCOME-PRE-EXTRAORDINARY>                                           27,566
<EXTRAORDINARY>                                                           0
<CHANGES>                                                                 0
<NET-INCOME>                                                         18,487
<EPS-PRIMARY>                                                          1.71
<EPS-DILUTED>                                                          1.70
<YIELD-ACTUAL>                                                         4.35
<LOANS-NON>                                                           1,616
<LOANS-PAST>                                                            910
<LOANS-TROUBLED>                                                         21
<LOANS-PROBLEM>                                                       2,547
<ALLOWANCE-OPEN>                                                     17,359
<CHARGE-OFFS>                                                           346
<RECOVERIES>                                                            243
<ALLOWANCE-CLOSE>                                                    17,969
<ALLOWANCE-DOMESTIC>                                                 17,969
<ALLOWANCE-FOREIGN>                                                       0
<ALLOWANCE-UNALLOCATED>                                                   0