EXHIBIT 21.1 SUBSIDIARIES OF SOUTHWEST BANCORPORATION OF TEXAS, INC. JURISDICTION OF NAME ORGANIZATION - -------------------------------------------------------------------------------- 1. Southwest Holding Delaware, Inc. Delaware 2. Southwest Bank of Texas National Association United States 3. Mitchell Mortgage Company L.L.C.* Texas 4. Southwest/Catalyst Capital, Ltd. Texas 5. Fairview, Inc.* Texas *Subsidiary of Southwest Bank of Texas National Association