Thornton is a town in Limestone County, Texas, United States. The population was 526 at the 2010 census.
Thornton is located at 31°24′36″N 96°34′25″W (31.409906, -96.573594).
According to the United States Census Bureau, the town has a total area of 1.0 square mile (2.6 km2), of which, 1.0 square mile (2.6 km2) of it is land and 1.00% is water.
The climate in this area is characterized by hot, humid summers and generally mild to cool winters. According to the Köppen Climate Classification system, Thornton has a humid subtropical climate, abbreviated "Cfa" on climate maps.
As of the census of 2000, there were 525 people, 206 households, and 147 families residing in the town. The population density was 529.5 people per square mile (204.8/km2). There were 248 housing units at an average density of 250.1 per square mile (96.7/km2). The racial makeup of the town was 88.00% White, 6.48% African American, 0.95% Native American, 0.19% Asian, 2.86% from other races, and 1.52% from two or more races. Hispanic or Latino of any race were 8.00% of the population.
There were 206 households, out of which 32.0% had children under the age of 18 living with them, 55.8% were married couples living together, 8.7% had a female householder with no husband present, and 28.6% were non-families.