• county
  • FIPS 39003
  • Largest town: Lima

Allen County, Ohio

Allen County had 100,866 residents in the Census Vintage 2024 estimate, on 402.6 square miles of land. It ranks 26th of 88 in Ohio by population and 76th by land area.

Population
100,866
#26 of 88 in Ohio · #618 in US
Area
402.6 sq mi
#76 of 88 in Ohio · #2,511 in US
Density
251 / sq mi
#25 of 88 in Ohio · #498 in US
Median household income
$65,665
#44 of 88 in Ohio · #1,329 in US

Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area

Allen County within Ohio. Pin: Columbus.

Measure from here

Tools and pages that start from Allen County

Allen County population, land area and income

Allen County had 100,866 residents in the Census Vintage 2024 estimate, on 402.6 square miles of land. It ranks 26th of 88 in Ohio by population and 76th by land area. That works out to 250.6 people per square mile, 2.6 times the US average of 96.3, and in the top quarter nationally.

The median county-equivalent in Ohio has 58,250 residents; Allen County is somewhat larger.

Its SAIPE 2023 median household income of $65,665 is above the national county median among 3,143 counties with an estimate.

National rank among 3,144

Population

100,866

3144th1st

618th of 3,144 (US)

Land area

403 sq mi

3144th1st

2511th of 3,144 (US)

Density

250.6 / sq mi

3144th1st

498th of 3,144 (US)

Median household income

$65,665

3143rd1st

1329th of 3,143 (US)

Rank within Ohio (88)

Population

100,866

88th1st

26th of 88 (OH)

Land area

403 sq mi

88th1st

76th of 88 (OH)

Density

250.6 / sq mi

88th1st

25th of 88 (OH)

Median household income

$65,665

88th1st

44th of 88 (OH)

How Allen County's population changed since 2020

Allen County lost 1,271 residents between the July 2020 and July 2024 estimates, a drop of 1.2%. That ranks 69th of 88 in Ohio for growth. The median Ohio county changed by -0.2%, and the state as a whole by +0.7%.

Since the April 2020 estimates base, Allen County recorded 5,056 births and 5,552 deaths, a natural change of -496. Net international migration added +424 and net domestic migration, people moving to or from other US counties, came to -1,318. The largest single component was domestic migration, which removed 1,318 people.

102.1k2020101.8k2021101.1k2022100.9k2023100.9k2024
Census Vintage 2024 county estimates for July 1 of each year. The axis starts above zero so year-to-year changes are visible.

Components of change, April 2020 to July 2024

Births
5,056
Deaths
5,552
Net international migration
+424
Net domestic migration
-1,318
Change, July 2023 to July 2024
+15

Where Allen County is

The Census internal point of Allen County is at 40.771600, -84.106100. It sits in UTM zone 16N. The map shades Ohio's 88 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Allen County outlined. Dots are towns of 1,000+ people with residents in it.

Shelby County: -0.4%Defiance County: +1.0%Darke County: -0.8%Seneca County: -0.6%Wood County: +0.6%Fayette County: -0.7%Clark County: -0.7%Hocking County: -2.2%Jackson County: +0.2%Miami County: +2.7%Richland County: -0.1%Union County: +13.7%Auglaize County: -1.2%Hancock County: +0.1%Morgan County: -1.6%Van Wert County: -0.1%Hardin County: -1.0%Paulding County: -0.3%Portage County: +1.2%Delaware County: +10.6%Harrison County: -3.1%Ross County: -1.3%Crawford County: -0.9%Clinton County: -0.0%Henry County: -0.5%Pike County: -0.0%Cuyahoga County: -1.7%Highland County: +1.0%Knox County: +1.7%Ottawa County: -1.5%Huron County: -0.6%Erie County: -2.2%Holmes County: +1.0%Lawrence County: -4.0%Marion County: -0.6%Fairfield County: +5.2%Putnam County: -0.6%Guernsey County: -0.5%Vinton County: -2.1%Gallia County: -1.2%Trumbull County: -0.7%Wayne County: -0.2%Perry County: +0.6%Ashland County: -0.1%Fulton County: -1.4%Brown County: +1.4%Lucas County: -1.1%Stark County: -0.1%Medina County: +1.1%Belmont County: -2.4%Williams County: -1.4%Mahoning County: -1.0%Noble County: +1.1%Greene County: +2.5%Preble County: -0.5%Allen County: -1.2%Athens County: +1.3%Jefferson County: -2.0%Adams County: +0.8%Monroe County: -2.3%Washington County: -2.2%Logan County: -0.1%Franklin County: +2.4%Warren County: +5.3%Wyandot County: -2.1%Licking County: +3.4%Hamilton County: +0.8%Clermont County: +2.6%Butler County: +2.2%Coshocton County: +1.1%Geauga County: -0.0%Sandusky County: -0.0%Ashtabula County: -0.6%Carroll County: -0.9%Tuscarawas County: -1.2%Morrow County: +2.7%Montgomery County: +0.1%Mercer County: +0.3%Lake County: -0.1%Pickaway County: +6.0%Madison County: +3.8%Muskingum County: +0.1%Meigs County: -3.0%Columbiana County: -1.8%Lorain County: +2.7%Scioto County: -2.8%Champaign County: +0.4%Summit County: -0.3%
Change 2020 to 2024
  1. < -1.4%
  2. < -0.6%
  3. < -0.0%
  4. < +1.1%
  5. ≥ +1.1%
no data

Orange pin: Allen County internal point. Dark pin: Columbus.

Internal point

Decimal
40.771600, -84.106100
DMS
40°46'17.76"N 84°06'21.96"W
UTM
16N 744235.1E 4517432.8N
Geohash
dphpyn5zc
Plus code
86GQQVCV+JH

Towns in Allen County

5 incorporated places of 1,000+ people have residents in Allen County, 46,356 people together, or 46% of the county. Each figure counts only the part of the town inside Allen County; towns marked "part" extend into another county. The largest is Lima with 34,690.

  1. 01Lima34,690
  2. 02Delphos (part)3,926
  3. 03Bluffton (part)3,672
  4. 04Spencerville2,164
  5. 05Elida1,904
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Allen County

The Census 2024 county adjacency file lists 5 neighbors for Allen County. The most populous is Hancock County, OH, with 75,016 residents. Distances run between Census internal points in a straight line.

Distance to Columbus and the nearest big city

Columbus is 80.7 miles SE of Allen County's internal point in a straight line. The nearest place of 100,000 or more is Fort Wayne, IN (population 273,203), 58.3 miles away. The nearest place of 10,000 or more is Lima, OH (population 34,690), 2.2 miles away.

Allen County FIPS code

The FIPS code of Allen County is 39003: state code 39 for Ohio plus county code 003. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $65,665.

Questions people ask

What is the population of Allen County, Ohio?

The Census Vintage 2024 estimate for July 1, 2024 is 100,866. That is down 1,271 people (1.2%) from the July 2020 estimate of 102,137.

What is the FIPS code of Allen County?

39003. The first two digits (39) are Ohio; the last three (003) identify the county.

What is the largest town in Allen County?

Lima, with 34,690 residents inside Allen County in 2024.

Which counties border Allen County?

5 county-equivalents border it in the Census 2024 adjacency file: Hancock County, OH; Auglaize County, OH; Putnam County, OH; Hardin County, OH; Van Wert County, OH.

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 county adjacency file
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.