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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 Commodore Stephen Decatur, Jr.
Decatur is located in western Benton County at 36°20′15″N 94°27′24″W (36.337541, -94.456721). Arkansas Highway 59 passes through the city, leading north 6 miles (10 km) to Gravette and 13 miles (21 km) to the Missouri border, and south 13 miles (21 km) to Siloam Springs. Arkansas Highway 102 leads east 16 miles (26 km) to Bentonville and west 10 miles (16 km) to the Oklahoma border.
According to the United States Census Bureau, Decatur has a total area of 4.5 square miles (11.7 km2), of which 4.4 square miles (11.5 km2) is land and 0.039 square miles (0.1 km2), or 1.21%, is water.
As of the 2010 census Decatur had a population of 1,699. The racial and ethnic makeup of the population was 62.4% non-Hispanic white, 0.5% non-Hispanic black, 4.3% Native American, 0.9% Asian, 5.2% from two or more races and 28.4% Hispanic or Latino.
As of the census of 2000, there were 1,314 people, 465 households, and 346 families residing in the city. The population density was 573.0 people per square mile (221.5/km2).