Allen is a census-designated place on the Pine Ridge Indian Reservation in Bennett County, South Dakota, United States, that was named for the Allen Township (civil township),[3] which it encompasses.

[4] It is one of two places which are closest to the North American continental pole of inaccessibility.

[5] According to the United States Census Bureau, the CDP has a total area of 3.9 square miles (10 km2), all land.

In North America, the continental pole of inaccessibility is between Kyle and Allen, located 1,650 km (1,030 mi) from the nearest coastline at 43°22′N 101°58′W / 43.36°N 101.97°W / 43.36; -101.97 (Pole of Inaccessibility North America).

There were 87 housing units (84 occupied) at an average density of 22.2 per sq mi (57 per km2).

[10] In 2015, the Minneapolis Star-Tribune editorial board wrote that American Horse had poor insulation, had too many students relative to building capacity, has tile flooring in poor repair and using asbestos, and "lacks the electrical and communications infrastructure needed to support the technology used in modern education.

[12] The Allen Youth Center, which opened in 2014, provides tutoring, recreation, and food distribution.