Decatur is a city, in Benton County, Arkansas, United States. The population was 1,699 at the 2010 census. It is part of the Fayetteville–Springdale–Rogers, AR-MO Metropolitan Statistical Area. This town is named after war hero Stephen Decatur, Jr.
Decatur is located at 36°20′15″N 94°27′24″W / 36.3375°N 94.45667°W / 36.3375; -94.45667 (36.337541, -94.456721).
According to the United States Census Bureau, the city has a total area of 2.3 square miles (5.9 km²), all of it land.