Thornton is a city in Calhoun County, Arkansas, United States.

U.S. Route 167 cuts across the southeast corner of the city limits, leading north to US 79 and Fordyce and south 16 miles (26 km) to Hampton, the Calhoun County seat.

There were 242 housing units at an average density of 126.6 per square mile (48.9/km2).

25.2% of all households were made up of individuals, and 14.1% had someone living alone who was 65 years of age or older.

The climate in this area is characterized by hot, humid summers and generally mild to cool winters.