Exhibit 12(b)


                           CERTIFICATIONS PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002


Pursuant to section 906 of the Sarbanes-Oxley Act of 2002 (18 U.S.C. section
1350), the undersigned officers of Mairs and Power Growth Fund, Inc. (the
"Fund") do hereby certify, to the best of each such officer's knowledge, that:

1.   The N-CSR of Mairs and Power Growth Fund, Inc. (the "Report") fully
     complies with the requirements of Section 13(a) or 15(d) 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 the operations of the
     Fund.


 /s/ William B. Frels
---------------------------------------------
William B. Frels
President

Date:   September 7, 2005


 /s/ Lisa J. Hartzell
---------------------------------------------
Lisa J. Hartzell
Treasurer

Date:   September 7, 2005


A signed original of this written statement required by section 906 has been
provided to the Fund and will be retained by the Fund and furnished to the
Securities and Exchange Commission or its staff upon request.