Killen is a town in Lauderdale County, Alabama, United States. It is part of the Florence - Muscle Shoals Metropolitan Statistical Area known as "The Shoals". It was incorporated in 1957. As of the 2010 census, the population of the town is 1,108, down from its record high of 1,119 in 2000.
Killen was founded on the Muscle Shoals Canal.
Killen is located at 34°51′42″N 87°31′46″W (34.861586, -87.529374).
According to the U.S. Census Bureau, the town has a total area of 1.9 square miles (4.9 km2), all land.
At the 2000 census there were 1,119 people, 435 households, and 338 families in the town. The population density was 585.0 people per square mile (226.2/km2). There were 484 housing units at an average density of 253.0 per square mile (97.8/km2). The racial makeup of the town was 95.26% White, 2.23% Black or African American, 0.45% Asian, 1.61% from other races, and 0.45% from two or more races. 2.59%. were Hispanic or Latino of any race.