Goldthwaite (established 1885) is a small city located in Mills County in Central Texas. The population was 1,878 at the 2010 census. It is the county seat of Mills County, which is named for John T. Mills, a justice of the Supreme Court for the Third, Seventh, and Eighth districts of the former Republic of Texas. Goldthwaite is located in the western portion of the Texas Hill Country. The elevation is 1,580 feet. Goldthwaite is situated at the intersections of U.S. Highways 84 and 183, Texas State Highway 16, and Texas Farm-to-Market Roads 572 and 574.