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
What distinguishes Allen County is density: among the most densely settled of US counties, around 592 people per square mile. Allen County is a county in Indiana with a population of 388,791. It is the #3-largest of all counties in Indiana nationally.
The typical household here earns about $68,839, below the US median of $78,538. The poverty rate is 9.2%, below the national 12.4%. The typical home is valued at $194,300, with typical rent around $976.
Educational attainment is on the higher side for US counties — 31.1% of adults hold a four-year degree, below the national 35.0%. Around 8.3% of workers work from home, below the national 14.0%, and the average commute runs about 22 minutes each way.
That density explains much of the rest of the profile in Allen County: denser places lean toward renting, shorter commutes by transit, and a younger working-age mix.
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+
Largest cities in 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.
Allen County, IN Climate
Allen County, IN has an average annual temperature of 10°C (50°F) and receives about 885 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
10°C
Avg Temp
885
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -5° / 23° | 46 mm |
| February | -3° / 27° | 44 mm |
| March | 3° / 38° | 68 mm |
| April | 9° / 49° | 85 mm |
| May | 16° / 60° | 92 mm |
| June | 21° / 70° | 96 mm |
| July | 23° / 74° | 91 mm |
| August | 22° / 72° | 82 mm |
| September | 18° / 64° | 76 mm |
| October | 11° / 52° | 62 mm |
| November | 5° / 41° | 74 mm |
| December | -1° / 29° | 69 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Allen County, IN
The most comfortable months to visit Allen County, IN are typically June, August and September, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 30°C high). The coldest is January (near -9°C low). June is usually the wettest month.
Where to stay near Allen County
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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.