<ARTICLE>                                            9
<LEGEND>
         This schedule  contains summary  financial  information  extracted from
unaudited financial statements of Enterprise Bancorp, Inc. at and for the period
ended  September  30, 1999 and is qualified in its entirety by reference to such
financial statements.
</LEGEND>
<MULTIPLIER>                                   1,000

                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                              DEC-31-1999
<PERIOD-START>                                 JAN-01-1999
<PERIOD-END>                                   SEP-30-1999
<CASH>                                         15,350
<INT-BEARING-DEPOSITS>                         0
<FED-FUNDS-SOLD>                               6,275
<TRADING-ASSETS>                               0
<INVESTMENTS-HELD-FOR-SALE>                    140,075
<INVESTMENTS-CARRYING>                         0
<INVESTMENTS-MARKET>                           0
<LOANS>                                        244,218
<ALLOWANCE>                                    5,549
<TOTAL-ASSETS>                                 414,030
<DEPOSITS>                                     333,967
<SHORT-TERM>                                   50,186
<LIABILITIES-OTHER>                            2,474
<LONG-TERM>                                    0
<PREFERRED-MANDATORY>                          0
<PREFERRED>                                    0
<COMMON>                                       32
<OTHER-SE>                                     27,371
<TOTAL-LIABILITIES-AND-EQUITY>                 414,030
<INTEREST-LOAN>                                15,146
<INTEREST-INVEST>                              5,358
<INTEREST-OTHER>                               67
<INTEREST-TOTAL>                               20,571
<INTEREST-DEPOSIT>                             7,231
<INTEREST-EXPENSE>                             7,968
<INTEREST-INCOME-NET>                          12,603
<LOAN-LOSSES>                                  270
<SECURITIES-GAINS>                             183
<EXPENSE-OTHER>                                10,275
<INCOME-PRETAX>                                4,173
<INCOME-PRE-EXTRAORDINARY>                     4,173
<EXTRAORDINARY>                                0
<CHANGES>                                      0
<NET-INCOME>                                   3,036
<EPS-BASIC>                                    0.95
<EPS-DILUTED>                                  0.91
<YIELD-ACTUAL>                                 4.80
<LOANS-NON>                                    802
<LOANS-PAST>                                   49
<LOANS-TROUBLED>                               494
<LOANS-PROBLEM>                                1,291
<ALLOWANCE-OPEN>                               5,234
<CHARGE-OFFS>                                  60
<RECOVERIES>                                   105
<ALLOWANCE-CLOSE>                              5,549
<ALLOWANCE-DOMESTIC>                           5,549
<ALLOWANCE-FOREIGN>                            0
<ALLOWANCE-UNALLOCATED>                        226