Smithville, TX -- U.S. city in Texas Population (2000): 3901 Housing Units (2000): 1672 Land area (2000): 3.506020 sq. miles (9.080550 sq. km) Water area (2000): 0.026885 sq. miles (0.069632 sq. km) Total area (2000): 3.532905 sq. miles (9.150182 sq. km) FIPS code: 68456 Located within: Texas (TX), FIPS 48 Location: 30.007096 N, 97.154924 W ZIP Codes (1990): 78957 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Smithville, TX Smithville