Demographics of Hamilton County, Indiana

Hamilton County, Indiana had 387,036 people on July 1, 2025, by the Census Bureau’s estimate: +38,025 since July 2020. Age, income, poverty, housing and origin below come from the American Community Survey, averaged over 2020–2024, each with its margin of error.

Hamilton County, in four figures

387,036
Population: July 1, 2025, Vintage 2025 estimate.; +10.9%
Change since July 2020: +38,025 people.; 38.4 ±0.2
Median age: ACS 2020–⁠2024.; $121,530 ±$2,737
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. Each year's change is births less deaths, net moves from abroad and net moves from elsewhere in the country, with the Bureau's small residual. The 2020 row's components run 3 months, from the April census to July 1.

Hamilton County, Indiana's population grew 10.9% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Hamilton County, Indiana's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).

U.S. Census Bureau — Census Bureau population estimates — counties and Puerto Rico municipios, with components of change

About this chart

The figures

Hamilton County, Indiana's population grew 10.9% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Hamilton County, Indiana's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).
July 1	Population	Index	United States
2020	349,011	100.0	100.0
2021	357,542	102.4	100.2
2022	366,036	104.9	100.7
2023	372,450	106.7	101.6
2024	379,685	108.8	102.5
2025	387,036	110.9	103.1

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Population of Hamilton County, Indiana on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	349,011	+1,521	+270	+33	+1,194
2021	357,542	+8,531	+1,441	+580	+6,624
2022	366,036	+8,494	+1,523	+2,132	+4,884
2023	372,450	+6,414	+1,562	+2,176	+2,684
2024	379,685	+7,235	+1,630	+2,776	+2,788
2025	387,036	+7,351	+1,618	+1,602	+4,121

Age, 2020–2024

The median age is 38.4 ±0.2: for men 37.6 ±0.3 and for women 39.1 ±0.3. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Hamilton County by age, ACS 2020–2024
Age	People	Share	Indiana	United States
Under 5	21,355 ±31	5.8% ±<0.1	6.0% ±<0.1	5.6% ±<0.1
5 to 17	71,381 ±1,592	19.6% ±0.4	17.3% ±0.1	16.3% ±<0.1
18 to 24	28,942 ±1,173	7.9% ±0.3	9.6% ±0.1	9.1% ±<0.1
25 to 44	98,439 ±1,801	27.0% ±0.5	25.8% ±0.1	26.9% ±<0.1
45 to 64	94,266 ±1,587	25.8% ±0.4	24.5% ±0.1	24.8% ±<0.1
65 and over	50,673 ±1,610	13.9% ±0.4	16.8% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $121,530 ±$2,737, and income per person $60,278 ±$1,129, in 2024 dollars. The median is $71,957 ±$352 in Indiana and $80,734 ±$166 in the United States.

Households by income

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Households in Hamilton County by income, ACS 2020–2024
Household income	Households	Share	Indiana	United States
Under $25,000	8,537 ±825	6.2% ±0.6	15.0% ±0.2	14.6% ±<0.1
$25,000 to $49,999	13,609 ±1,157	9.9% ±0.8	19.4% ±0.2	16.7% ±<0.1
$50,000 to $74,999	17,955 ±1,245	13.1% ±0.9	17.7% ±0.2	15.5% ±<0.1
$75,000 to $99,999	16,528 ±1,207	12.0% ±0.9	13.9% ±0.2	12.6% ±<0.1
$100,000 to $149,999	26,588 ±1,537	19.4% ±1.1	17.5% ±0.2	17.5% ±<0.1
$150,000 to $199,999	19,740 ±1,170	14.4% ±0.8	8.3% ±0.1	9.6% ±<0.1
$200,000 or more	34,295 ±1,288	25.0% ±0.9	8.2% ±0.1	13.4% ±0.1

Poverty by age

The poverty rate is the share of people whose family income is below the federal threshold for their family’s size, of everyone for whom the Bureau determines it (B17020).

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Poverty rate in Hamilton County by age, ACS 2020–2024
Age	Below poverty	Rate	Indiana	United States
All ages	15,924 ±1,930	4.4% ±0.5	12.3% ±0.2	12.5% ±0.1
Under 18	4,009 ±715	4.4% ±0.8	16.0% ±0.3	16.1% ±0.1
18 to 59	8,719 ±1,153	4.3% ±0.6	11.9% ±0.2	11.6% ±0.1
60 and over	3,196 ±535	4.6% ±0.8	9.6% ±0.2	11.0% ±<0.1

Housing, 2020–2024

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Housing in Hamilton County, ACS 2020–2024
Measure	Hamilton County	Indiana	United States
Housing units	144,746 ±116	2,976,568 ±617	143,775,355 ±10,234
Occupied	94.8% ±0.6	91.2% ±0.2	89.9% ±0.1
Vacant	5.2% ±0.7	8.8% ±0.2	10.1% ±0.1
Owner occupied	76.1% ±0.8	70.6% ±0.3	65.2% ±0.3
Renter occupied	23.9% ±1.0	29.4% ±0.3	34.8% ±0.1
Median home value	$405,500 ±$5,201	$218,200 ±$739	$332,700 ±$236
Median gross rent	$1,574 ±$42	$1,062 ±$5	$1,413 ±$2
Median year built	2001 ±1	1976 ±1	1980 ±1

Occupied and vacant are shares of all housing units; owner and renter occupied are shares of occupied units. Value and rent are medians in 2024 dollars.

Origin and place of birth, 2020–2024

Hispanic or Latino origin is not a race in the Census Bureau’s tables. Here the people of Hispanic origin, of any race, are one row, and everyone else is counted by race alone (B03002), so the rows add to the whole.

Hispanic origin and race

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People in Hamilton County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Indiana	United States
Hispanic or Latino	20,577 ±0	5.6% ±<0.1	8.6% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	287,023 ±1,030	78.6% ±0.3	75.4% ±<0.1	57.4% ±<0.1
Black alone, not Hispanic	16,123 ±1,063	4.4% ±0.3	9.1% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	25,023 ±985	6.9% ±0.3	2.6% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	47 to 161	< 0.1%	0.1% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	47 to 193	< 0.1% to 0.1%	< 0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	2,072 ±628	0.6% ±0.2	0.4% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	14,014 ±1,689	3.8% ±0.5	3.8% ±0.1	4.3% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Place of birth and citizenship

“Born a citizen outside the states” counts people born in Puerto Rico, the island areas, or abroad to American parents. Naturalized citizens and those who are not citizens together make up the people born abroad (B05002).

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People in Hamilton County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Indiana	United States
Born in the state	210,348 ±3,490	57.6% ±1.0	67.0% ±0.2	57.3% ±<0.1
Born in another state	112,540 ±3,401	30.8% ±0.9	25.8% ±0.2	26.9% ±<0.1
Born a citizen outside the states	4,612 ±673	1.3% ±0.2	0.8% ±<0.1	1.7% ±<0.1
Born abroad	37,556 ±2,084	10.3% ±0.6	6.3% ±0.1	14.1% ±<0.1
Naturalized citizens	18,593 ±1,469	5.1% ±0.4	2.6% ±0.1	7.4% ±<0.1
Not citizens	18,963 ±1,750	5.2% ±0.5	3.7% ±0.1	6.8% ±<0.1

Hamilton County among the counties of Indiana

4th of 92 by population, July 2025. Every one is listed on the Indiana page.

Counties of Indiana near Hamilton County in population, July 2025
County	July 2025	Change since 2020
Marion County	992,196	+1.6%
Lake County	504,612	+1.1%
Allen County	402,329	+4.2%
Hamilton County	387,036	+10.9%
St. Joseph County	272,861	+0.1%
Elkhart County	208,774	+0.9%
Hendricks County	193,510	+10.2%
Tippecanoe County	190,456	+2.2%
Vanderburgh County	181,995	+0.9%

Elsewhere on the site

Sources

Census Bureau population estimates — counties and Puerto Rico municipios, with components of change — U.S. Census Bureau · U.S. Government work · retrieved September 25, 2026
American Community Survey 5-year estimates — table-based Summary File · U.S. Government work

Data retrieved September 25, 2026