Allen County, Ohio

county in Ohio, United States

Allen County is a county of Ohio in the United States. As of the 2020 census, 102,206 people lived there.[1] The county seat is Lima.

Allen County
Allen County Courthouse in Lima
Allen County Courthouse in Lima
Map of Ohio highlighting Allen County
Location within the U.S. state of Ohio
Map of the United States highlighting 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 forJohn Allen
Largest cityLima
 • Total407 sq mi (1,050 km2)
 • Land402 sq mi (1,040 km2)
 • Water4.4 sq mi (11 km2)  1.1%
 • Total102,206
 • Density250/sq mi (97/km2)
Time zoneUTC−5 (Eastern)
 • Summer (DST)UTC−4 (EDT)
Congressional district4th


  1. "QuickFacts: Allen County, Ohio". United States Census Bureau. Retrieved January 18, 2024.