Allen County, Indiana Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 3rd-largest in Indiana
The population of Allen County, Indiana is 388,791 as of the 2023 American Community Survey, making it the 3rd-largest county in Indiana. The median household income is $68,839, the median home value is $194,300, and the median age is 36.2.
The population of Allen County has grown 12.2% since 2010 (355,956 → 399,295), a +0.82% annualized rate.
388,791
Population
+0.82%
Annual growth
592
People / sq mi
$68,839
Median Income
$194,300
Median Home Value
Allen County covers 657 sq mi of land at 591.6 people per square mile.
About Allen County, IN
Allen County is a county in Indiana with a population of 388,791. It ranks #3 among counties in Indiana by population. The median age is 36.2, younger than the national median. The population is 49.2% male and 50.8% female.
The median household income in Allen County is $68,839, below the US median of $74,580. 9.2% of residents live below the federal poverty level. Home values sit at a median of $194,300, with monthly rent averaging $976. The homeownership rate of 69.1% is higher than the national rate of 64.8%.
Educational attainment in Allen County reflects 31.1% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 8.3% of workers primarily work from home, below the national work-from-home rate of 14.2%. The average commute is 21.7 minutes each way.
Allen County Population History (2010-2024)
The county of Allen County had a population of 355,956 in 2010 and 399,295 in 2024, a 12.2% growth over 14 years. The peak was 399,295 in 2024. Average annual growth rate: 0.82%.
399,295
Population (2024)
355,956
Population (2010)
399,295
Peak (2024)
0.82%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 355,956 |
| 2011 | 359,013 |
| 2012 | 360,946 |
| 2013 | 363,432 |
| 2014 | 365,254 |
| 2015 | 367,508 |
| 2016 | 369,526 |
| 2017 | 371,803 |
| 2018 | 375,076 |
| 2019 | 379,006 |
| 2020 | 386,123 |
| 2021 | 389,220 |
| 2022 | 392,119 |
| 2023 | 395,131 |
| 2024 | 399,295 |
Race & Ethnicity
| White | 72.7% |
| Black or African American | 10.9% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.3% |
| Two or More Races | 0.0% |
Age & Sex
36.2
Median Age
50.8%
Female
49.2%
Male
15.3%
Age 65+
Age Distribution
Children (under 15): 21.1% · Seniors (65+): 15.3%
Income & Poverty
| Median household income | $68,839$-1,212 vs state |
| Mean household income | $90,889 |
| Per-capita income | $36,432 |
| Poverty rate | 9.2%+0.8% vs state |
| Unemployment rate | 3.1% |
| Employment-to-population | 63.3% |
Top Industries by Employment
The largest employment sector in Allen County is professional & business services, accounting for 24.6% of workers.
How residents commute
0.8%
Drive alone
1.2%
Carpool
79.1%
Public transit
8.3%
Work from home
21.7 min
Avg commute
Housing
$194,300$-7,300 vs state
Median home value
$976
Median rent
69.1%
Homeownership rate
164,456
Total housing units
93.8%
Occupied
6.2%
Vacant
30.9%
Renter-occupied
Social & access
91.8%
With health insurance
94.8%
With broadband internet
24.1%
Foreign-born
6.6%
Veterans (18+)
12.3%
With a disability
87.5%
Speak language other than English at home
Education
90.3%
High School+
31.1%
Bachelor's+
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Other counties in Indiana
Part of Indiana
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County rankings
Common questions about Allen County, IN
Frequently Asked Questions
Allen County, Indiana has a population of 388,791 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 3rd-largest county in Indiana. Population density is 592 people per square mile.
The population of Allen County has grown 12.2% since 2010 (355,956 → 399,295), a +0.82% annualized rate.
The median household income in Allen County, Indiana is $68,839, with mean (average) household income of $90,889 and per-capita income of $36,432. 9.2% of residents live below the federal poverty level.
In Allen County, the largest racial and ethnic groups are White (72.7%), Black or African American (10.9%), Hispanic or Latino (1.3%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Allen County, Indiana is 36.2 years. Residents are 50.8% female and 49.2% male.
The median home value in Allen County is $194,300 and median monthly rent is $976. 69.1% of occupied housing units are owner-occupied. The county has 164,456 total housing units, 6.2% of which are vacant.
The largest employment sector in Allen County, Indiana is professional, scientific, and management services, employing 24.6% of workers. The unemployment rate is 3.1%.
Indianapolis is among the largest cities associated with Allen County, Indiana, with a population of 882,043.
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Statewide data for Indiana
Population, race, income, age, and trends across Indiana
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.