EXHIBIT 99.1

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


     Pursuant to Section 1350, Chapter 63 of Title 18, United States Code, as
adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, the
undersigned, as Chief Executive Officer of Southwest Bancorporation of Texas,
Inc. (the "Company"), does hereby certify that:

     1) the Company's Quarterly Report on Form 10-Q for the quarter ended March
31, 2003 (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 Company's Report fairly presents, in
all material respects, the financial condition and results of operations of the
Company.

Dated: April 30, 2003

                                        /s/ Paul B. Murphy, Jr.
                                        ----------------------------------------

                                        Paul B. Murphy, Jr.
                                        Director, President and
                                        Chief Executive Officer