San Juan, TX -- U.S. city in Texas Population (2000): 26229 Housing Units (2000): 7719 Land area (2000): 11.006794 sq. miles (28.507464 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 11.006794 sq. miles (28.507464 sq. km) FIPS code: 65516 Located within: Texas (TX), FIPS 48 Location: 26.192451 N, 98.152708 W ZIP Codes (1990): 78589 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: San Juan, TX San Juan