William P. Morrissey                                    Immediately
     Senior Vice President
     (617) 628-4000

                CENTRAL BANCORP REPORTS 94% EARNINGS IMPROVEMENT
                     FOR ITS JUNE 2002 QUARTER, AND DECLARES
                       ITS REGULAR QUARTERLY CASH DIVIDEND

     SOMERVILLE,  MASSACHUSETTS,  July 15, 2002-- Central Bancorp, Inc. (NASDAQ:
CEBK) today reported that its net income nearly doubled to $1,027,000,  or $0.63
per diluted share,  for the three months ended June 30, 2002, from $530,000,  or
$0.32 per diluted share, for the corresponding quarter in the prior fiscal year.

     The  93.8%  earnings  increase  primarily  resulted  from  an  increase  of
$1,045,000 in net interest and dividend income  principally due to a decrease in
the  Company's  cost of funds.  During  the  quarter  ended June 30,  2002,  the
weighted average cost of all interest-bearing  liabilities was 3.31% compared to
4.57% for the quarter ended June 30, 2001,  reflecting  the general  decrease in
interest  rates  occurring  over the past  eighteen  months.  The  Company  also
benefited  during the quarter from  elimination of the amortization of goodwill,
as required by revised  accounting rules, which amounted to $72,000 in the first
quarter of the prior fiscal year.

     The increase in earnings in this year's quarter occurred despite a decrease
of  $192,000 in net gains on sales and  write-downs  of  investment  securities.
During the quarter  ended June 30, 2002,  the Company  recorded  write-downs  of
$215,000 in certain equity securities to recognize an impairment in value deemed
to be other than temporary.

     Loan quality continued to be outstanding,  with no non-performing loans and
no foreclosed  property held by the Company at June 30, 2002. Loan delinquencies
continued to be virtually non-existent.

     John D. Doherty, President & Chief Executive Officer, stated, " We are very
pleased with the  continuing  improvement  in net interest and dividend  income,
which  increased  4.1%  compared to the quarter  ended  March 31,  2002.  We are
particularly  pleased  with the  impact  that the $10.2  million  growth in core
deposits during the quarter had on this improvement."

                                   (continued)

Central Bancorp, Inc.
Page 2 of 3


     The Company also announced today that its Board of Directors has declared a
regular  quarterly cash dividend of $0.10 per share.  The dividend is payable on
August 16, 2002 to stockholders of record on August 2, 2002. This represents the
Company's  24th  consecutive  distribution  since  implementing  a cash dividend
policy in October 1996.

     Central Bancorp, Inc., is the holding company for Central Bank, whose legal
name is Central Co-operative Bank, a  Massachusetts-chartered  co-operative bank
operating eight full-service banking offices in suburban Boston.


                           (See accompanying tables.)

- --------------------------------------------------------------------------------

This earnings report may contain certain forward-looking  statements,  which are
based on management's current expectations  regarding economic,  legislative and
regulatory  issues that may impact the  Company's  earnings  in future  periods.
Factors  that  could  cause  future  results  to vary  materially  from  current
management  expectations  include,  but are not  limited  to,  general  economic
conditions,  changes in interest  rates,  deposit flows,  real estate values and
competition;  changes in accounting principles,  policies or guidelines; changes
in legislation or regulation;  and other  economic,  competitive,  governmental,
regulatory  and  technological   factors  affecting  the  Company's  operations,
pricing, products and services.

- --------------------------------------------------------------------------------


Central Bancorp, Inc.
Page 3 of 3

                              CENTRAL BANCORP, INC.
                           CONSOLIDATED OPERATING DATA
                      (IN THOUSANDS, EXCEPT PER SHARE DATA)


                                                                 Quarter Ended
                                                                    June 30,
                                                          ---------------------------
                                                            2002               2001
                                                          ---------------------------
                                                                  (Unaudited)
                                                                        
Net interest and dividend income                          $ 4,280             $ 3,235

Net gain on sales and write-downs
  of investment securities                                     11                 203

Other non-interest income                                     212                 206

Non-interest expenses                                       2,891               2,811
                                                          -------             -------
  Income before taxes                                       1,612                 833

Provision for income taxes                                    585                 303
                                                          -------             -------
  Net income                                              $ 1,027             $   530
                                                          =======             =======
Earnings per share:

  Basic                                                   $  0.64             $  0.32
                                                          =======             =======
  Diluted                                                 $  0.63             $  0.32
                                                          =======             =======
Weighted average number of
  shares outstanding:

  Basic                                                     1,606               1,661
                                                          =======             =======
  Diluted                                                   1,625               1,670
                                                          =======             =======




                                                     CONSOLIDATED BALANCE SHEET DATA
                                                              (IN THOUSANDS)

                                                       JUNE 30,          March 31,
                                                          2002                2002
                                                     --------------------------------
                                                      (UNAUDITED)
                                                                      
Total assets                                            $ 473,273           $ 468,219
Total loans                                               363,136             371,707
Allowance for loan losses                                   3,293               3,292
Deposits                                                  271,073             261,907
Borrowings                                                159,255             164,000
Stockholders' equity                                       39,072              38,954