Trinity -- U.S. County in Texas Population (2000): 13779 Housing Units (2000): 8141 Land area (2000): 692.844560 sq. miles (1794.459095 sq. km) Water area (2000): 21.158212 sq. miles (54.799514 sq. km) Total area (2000): 714.002772 sq. miles (1849.258609 sq. km) Located within: Texas (TX), FIPS 48 Location: 31.008608 N, 95.204909 W Headwords: Trinity Trinity, TX Trinity County Trinity County, TX