Union Grove, TX -- U.S. city in Texas Population (2000): 346 Housing Units (2000): 130 Land area (2000): 0.958067 sq. miles (2.481382 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.958067 sq. miles (2.481382 sq. km) FIPS code: 74312 Located within: Texas (TX), FIPS 48 Location: 32.583227 N, 94.909607 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Union Grove, TX Union Grove