Austin -- U.S. County in Texas Population (2000): 23590 Housing Units (2000): 10205 Land area (2000): 652.593241 sq. miles (1690.208664 sq. km) Water area (2000): 3.781611 sq. miles (9.794326 sq. km) Total area (2000): 656.374852 sq. miles (1700.002990 sq. km) Located within: Texas (TX), FIPS 48 Location: 29.853909 N, 96.239441 W Headwords: Austin Austin, TX Austin County Austin County, TX