Dumas, TX -- U.S. city in Texas Population (2000): 13747 Housing Units (2000): 5119 Land area (2000): 5.127616 sq. miles (13.280463 sq. km) Water area (2000): 0.018963 sq. miles (0.049115 sq. km) Total area (2000): 5.146579 sq. miles (13.329578 sq. km) FIPS code: 21556 Located within: Texas (TX), FIPS 48 Location: 35.862478 N, 101.966931 W ZIP Codes (1990): 79029 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Dumas, TX Dumas