EXHIBIT 32.1

                    CERTIFICATION BY CHIEF EXECUTIVE OFFICER
                       PURSUANT TO 18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2003

     In connection with the Quarterly Report of Numerex Corp. (the "Company") on
Form 10-Q as filed with the Securities and Exchange Commission on the date
hereof (the "Report"), I, Stratton J. Nicolaides, as Chief Executive Officer of
the Company, hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted
pursuant to Section 906 of the Sarbanes-Oxley Act of 2003, to the best of my
knowledge, that:

     (1)  The Report fully complies with the requirements of section 13(a) of
the Securities Exchange Act of 1934; and

     (2)  The information contained in the Report fairly presents, in all
material respects, the financial condition and results of operations of the
Company for the dates and periods covered by the Report.

     This certificate is being made for the exclusive purpose of compliance by
the Chief Executive Officer of the Company with the requirements of Section 906
of the Sarbanes-Oxley Act of 2003, and may not be disclosed, distributed or used
by any person or for any reason other than as specifically required by law.

May 12, 2004                           /s/ Stratton J. Nicolaides
                                       --------------------------------
                                       Stratton J. Nicolaides
                                       Chief Executive Officer

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