Thrall is a city in Williamson County, Texas, United States. The population was 710 at the 2000 census, and 839 at the 2010 census. By 2011, the population had grown to 898. The name Thrall was chosen by the community to honor the Rev. Homer S. Thrall, a Methodist minister and historian much admired by local settlers and residents. Thrall was founded in 1876.