Allen County, Ohio

Allen County
Allen County Courthouse in Lima
Location within the U.S. state of Ohio
Ohio's location within the U.S.
Coordinates: 40°46′N 84°07′W / 40.77°N 84.12°W / 40.77; -84.12
Country United States
State Ohio
FoundedMarch 1, 1831
Named afterJohn Allen
SeatLima
Largest cityLima
Area
  Total
407 sq mi (1,050 km2)
  Land402 sq mi (1,040 km2)
  Water4.4 sq mi (11 km2)  1.1%
Population
 (2020)
  Total
102,206
  Density250/sq mi (100/km2)
Time zoneUTC−5 (Eastern)
  Summer (DST)UTC−4 (EDT)
Congressional district4th
Websiteallencountyohio.com

Allen County is a county located in the northwestern part of the U.S. state of Ohio. Its county seat and largest city is Lima. The county was created in 1820 and organized in 1831. The county is named in honor of Colonel John Allen, who was killed leading his men at the Battle of Frenchtown during the War of 1812.

Allen County comprises the Lima metropolitan statistical area, and as of the 2020 census, the population was 102,206. Allen County also comprises the entirety of the Lima, OH media market.