Allen County, Kansas

Allen County
Location within the U.S. state of Kansas
Kansas's location within the U.S.
Coordinates: 37°53′N 95°17′W / 37.883°N 95.283°W / 37.883; -95.283
Country United States
State Kansas
FoundedAugust 25, 1855
Named afterWilliam Allen
SeatIola
Largest cityIola
Area
  Total
505 sq mi (1,310 km2)
  Land500 sq mi (1,000 km2)
  Water5.0 sq mi (13 km2)  1.0%
Population
 (2020)
  Total
12,526
  Density25.1/sq mi (9.7/km2)
Time zoneUTC−6 (Central)
  Summer (DST)UTC−5 (CDT)
Area code620
Congressional district2nd
WebsiteAllenCounty.org

Allen County is a county located in the southeast portion of the U.S. state of Kansas. Its county seat and most populous city is Iola. As of the 2020 census, the population was 12,526. The county was named for William Allen, a U.S. Senator from Ohio and prominent supporter of westward expansion.