Allen Map
Allen is a census-designated place in Bennett County, South Dakota. As of the 2010 census, the CDP had a population of 420. It is considered the poorest place in the United States. It is one of two settlements which are closest to the North American continental pole of inaccessibility.
According to the United States Census Bureau, the CDP has a total area of 3.9 square miles (10.2 km²), all of it land.
Allen has been assigned the ZIP code 57714.
Nearby cities include Martin, Batesland, Kyle, Wanblee.