Allen County, Ohio

Allen County: County in Ohio, United States


Allen County is a county located in the U.S. state of Ohio. As of the 2010 census, the population was 106,331 and a population density of 101 people per km². After 10 years in 2020 county had an estimated population of 101,980 inhabitants. Its county seat is Lima. The county was created 192 years ago in 1831.

Quick Facts about Allen County

Population : 101,980 (2020)
Country : United States of America
State : Ohio (United States)
Different from : Alleghany County, Allegany County, Allegan County, Allegheny County, Alleghany County
Plate code : 02
Area : 1054 km2
Official name : Allen County
Water as percent of area : 1.1%
Land as percent of area : 98.9%
Named for : Ethan Allen
Capital : Lima
Establishment : March 03, 1831
Time Zone : America/New_York
Local time : 04:33:46 (2nd June 2023)
Density : 97 Pop. per km² as of 2020
Population growth : -4.27% (2010-2020)
Allen County locator map
Location of Allen County on Ohio map.
Lima-ohio-courthouse image
Lima-ohio-courthouse image


Allen County is located at 40°46'17"N 84°6'21"W (40.7715200, -84.1057800). It has 4 neighbors: Auglaize County, Hardin County, Putnam County and Van Wert County.

Allen County map

The largest city of Allen County is Fort Shawnee with a population of 3,726. Other cities include, Spencerville population 2,142, Harrod population 406 and Beaverdam population 369. See all Allen County cities & populated places.

Allen County Populated Places

Cities, Towns, Neighborhoods & Other Populated Places in Allen County.

City Name Population Title
Bluffton 4,030 Town in northwest Ohio
Fort Shawnee 3,726 City in Allen County, Ohio, United States of America
Spencerville 2,142 City in Allen County, Ohio, United States of America
Elida 1,810 Town in New Mexico, United States
Cairo 520 Town in Ohio, United States
Harrod 406 Human settlement in Allen County, Ohio, United States of America
Beaverdam 369 Human settlement in Allen County, Ohio, United States of America

Allen County has 4 neighbours.

  • Lima


According to census records, the population of Allen County decreased by 4.27% in 10 years.

Year Population % Change Method
2010 106,331 - census
2011 105,988 -0.32% estimation process
2012 105,244 -0.71% estimation process
2013 105,055 -0.18% estimation process
2014 104,848 -0.2% estimation process
2015 104,095 -0.72% estimation process
2016 103,613 -0.47% estimation process
2017 103,093 -0.5% estimation process
2018 102,725 -0.36% estimation process
2019 102,351 -0.37% estimation process
2020 101,980 -0.36% estimation process

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Other places with the same name (4)

Ohio Other Counties (more counties)

County Name Population Title
Franklin County 1,324,624 County in Massachusetts, United States
Cuyahoga County 1,227,883 County in Ohio, United States
Columbus 884,356 Capital city of Ohio, United States
Hamilton County 817,985 County in New York, United States
Summit County 538,866 County in northern Utah, United States
Montgomery County 531,610 County in Ohio, United States
Lucas County 428,294 County in Ohio, United States
Butler County 385,648 County in Ohio, United States of America
Cleveland 378,589 City in Ohio, United States
Stark County 369,772 County in Ohio, United States
Lorain County 312,172 County in Ohio, United States
Cincinnati 304,548 City in Ohio, United States; county seat of Hamilton County
Toledo 271,455 County seat of Lucas County, Ohio, United States
Warren County 238,412 County in New York, United States
Lake County 229,569 County in Ohio, United States
Mahoning County 226,075 County in Ohio, United States