Hamilton County, Indiana Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 4th-largest in Indiana
The population of Hamilton County, Indiana is 357,176 as of the 2023 American Community Survey, making it the 4th-largest county in Indiana. The median household income is $117,957, the median home value is $379,100, and the median age is 38.0.
The population of Hamilton County has grown 37.3% since 2010 (276,499 → 379,704), a +2.29% annualized rate.
357,176
Population
+2.29%
Annual growth
906
People / sq mi
$117,957
Median Income
$379,100
Median Home Value
Hamilton County covers 394 sq mi of land at 905.6 people per square mile.
About Hamilton County, IN
Educational attainment is the headline number in Hamilton County: 61.8% of adults 25 and older have a four-year degree. Hamilton County is a county in Indiana with a population of 357,176. It is the #4-largest of all counties in Indiana nationally.
Income is a real outlier — the median household pulls in $117,957, putting Hamilton County near the top of US counties. Poverty is among the lowest of comparable US counties, at 2.8% — below the national 12.4%. Home prices are steep, with the typical property valued at $379,100, with typical rent around $1,468.
The population is unusually well-credentialed for US counties — 61.8% of adults have a four-year degree, above the national 35.0%. Working from home is common here: 20.7% of workers do so, above the national 14.0%, and the average commute runs about 26 minutes each way.
The education numbers are the throughline: a college-heavy population in Hamilton County usually coincides with higher incomes and a workforce concentrated in professional and information industries.
Hamilton County Population History (2010-2024)
The county of Hamilton County had a population of 276,499 in 2010 and 379,704 in 2024, a 37.3% growth over 14 years. The peak was 379,704 in 2024. Average annual growth rate: 2.29%.
379,704
Population (2024)
276,499
Population (2010)
379,704
Peak (2024)
2.29%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 276,499 |
| 2011 | 283,405 |
| 2012 | 289,821 |
| 2013 | 296,970 |
| 2014 | 302,921 |
| 2015 | 308,623 |
| 2016 | 316,221 |
| 2017 | 323,225 |
| 2018 | 330,635 |
| 2019 | 337,955 |
| 2020 | 349,031 |
| 2021 | 357,691 |
| 2022 | 366,264 |
| 2023 | 372,588 |
| 2024 | 379,704 |
Race & Ethnicity
| White | 81.6% |
| Black or African American | 4.2% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 0.7% |
| Two or More Races | 0.0% |
Age & Sex
38.0
Median Age
50.8%
Female
49.2%
Male
13.5%
Age 65+
Age Distribution
Children (under 15): 21.0% · Seniors (65+): 13.5%
Income & Poverty
| Median household income | $117,957+$47,906 vs state |
| Mean household income | $156,318 |
| Per-capita income | $58,929 |
| Poverty rate | 2.8%-5.6% vs state |
| Unemployment rate | 2.0% |
| Employment-to-population | 69.2% |
Top Industries by Employment
The largest employment sector in Hamilton County is professional & business services, accounting for 24.7% of workers.
How residents commute
0.0%
Drive alone
0.8%
Carpool
71.0%
Public transit
20.7%
Work from home
25.8 min
Avg commute
Housing
$379,100+$177,500 vs state
Median home value
$1,468
Median rent
76.3%
Homeownership rate
140,389
Total housing units
94.9%
Occupied
5.1%
Vacant
23.7%
Renter-occupied
Social & access
95.8%
With health insurance
98.3%
With broadband internet
31.7%
Foreign-born
4.9%
Veterans (18+)
7.8%
With a disability
88.5%
Speak language other than English at home
Education
97.3%
High School+
61.8%
Bachelor's+
Largest cities in Indiana
Other counties in Indiana
Part of Indiana
Metro areas in Indiana
County rankings
Frequently Asked Questions
Hamilton County, Indiana has a population of 357,176 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 4th-largest county in Indiana. Population density is 906 people per square mile.
The population of Hamilton County has grown 37.3% since 2010 (276,499 → 379,704), a +2.29% annualized rate.
The median household income in Hamilton County, Indiana is $117,957, with mean (average) household income of $156,318 and per-capita income of $58,929. 2.8% of residents live below the federal poverty level.
In Hamilton County, the largest racial and ethnic groups are White (81.6%), Black or African American (4.2%), Hispanic or Latino (0.7%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Hamilton County, Indiana is 38.0 years. Residents are 50.8% female and 49.2% male.
The median home value in Hamilton County is $379,100 and median monthly rent is $1,468. 76.3% of occupied housing units are owner-occupied. The county has 140,389 total housing units, 5.1% of which are vacant.
The largest employment sector in Hamilton County, Indiana is professional, scientific, and management services, employing 24.7% of workers. The unemployment rate is 2.0%.
Indianapolis is among the largest cities associated with Hamilton 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.