What is the largest city in Allen County, OH?

Lima is the largest city or town in Allen County, with about 35,010 residents.

How many ZIP codes are in Allen County?

Allen County includes 12 ZIP Code Tabulation Areas, including 45801, 45804, 45805, 45806, 45807.

What is the population of Allen County, OH?

About 101,348 people live in Allen County, based on American Community Survey 5-year estimates.

What counties border Allen County?

Allen County borders Hancock County, Auglaize County, Putnam County, Hardin County, Van Wert County.

Allen County, OH: Cities, ZIP Codes & Local Data

Population

101,348

Land area

403sq mi

People per sq mi

252

ZIP codes

12

Allen County at a glance

Households here earn a median of $64,038 a year, 10% less than the Ohio figure of $71,389.
A typical owner-occupied home is valued at $165,300 (23% below Ohio) and median rent is $922 a month.
The biggest population centers are Lima (35,010), Delphos (7,143) and Fort Shawnee (6,209).

Local data for Allen County, OH

Counts from official public data

Housing and community stats

Allen County, OH, American Community Survey 2020-2024

Full profile

Median household income

$64,038

Poverty rate

13.3%

Median home value

$165,300

Prices +7.8% in a year

Median rent

$922/mo

Homeownership

67.7%

Bachelor's or higher

20.1%

Median age

39.7

Average commute

18.7 min

Largest reported origins and ancestries: German Americans (29,288), Irish Americans (11,611), Italian Americans (3,007).

Home values and rents Income, education and commute

Economy and federal money

Jobs, income, federal spending and pandemic loans

Details

Unemployment rate

3.7%

Sep 2026, -0.8 pts in a year

Average annual pay

$60,415

50,015 jobs, 2025

Income per person

$56,066

BEA, 2024

Federal spending

$646M

FY 2026, $6,324 per person

PPP loans

$199M

2,461 loans, 25,718 jobs reported

Campaign donations

$302K

Itemized, 2026 cycle

Economy Federal spending PPP loans

How people get to work

Allen County, OH, workers 16 and older. American Community Survey 5-year estimates

Drove alone82.8%
Carpooled8.9%
Public transit0.4%
Walked1.2%
Bicycle0.4%
Taxi, ride-hailing, motorcycle or other1.5%
Worked from home4.8%

Average one-way commute: 18.7 minutes for people who do not work from home.

Environment and hazard risk

Allen County, OH, from FEMA, NOAA and EPA

Full report

Natural hazard risk

Relatively Low

Top: earthquake

Storm events since 1996

317

Most often thunderstorm wind

Flood insurance policies

163

0.4% of homes, county

July high / Jan low

84° / 19°F

41.2 inches of rain a year

Hazards, floods and storm history Check a flood zone 26 historic places

Health statistics

Share of adults in Allen County, OH, CDC PLACES estimates

All 40 measures

Obesity

39.7%

U.S. 33.3% +6.4 pts

Diabetes

14.5%

U.S. 12.1% +2.4 pts

Smoking

17.0%

U.S. 12.8% +4.2 pts

Uninsured (18-64)

8.3%

U.S. 11.1% -2.8 pts

Cities, towns and ZIP codes in Allen County

Population shown

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Frequently asked questions

What is the largest city in Allen County, OH?: Lima is the largest city or town in Allen County, with about 35,010 residents.
How many ZIP codes are in Allen County?: Allen County includes 12 ZIP Code Tabulation Areas, including 45801, 45804, 45805, 45806, 45807.
What is the population of Allen County, OH?: About 101,348 people live in Allen County, based on American Community Survey 5-year estimates.
What counties border Allen County?: Allen County borders Hancock County, Auglaize County, Putnam County, Hardin County, Van Wert County.