Hamilton County Demographics

A map of Hamilton County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	287,023	275,185	78.6%	79.2%
Asian	25,023	23,459	6.9%	6.8%
Hispanic	20,577	18,106	5.6%	5.2%
Black	16,123	14,674	4.4%	4.2%
Multiracial	14,014	14,024	3.8%	4.0%
Native American/Other	2,296	2,019	0.6%	0.6%

Hamilton County, Indiana has an estimated population of 365,056, an increase from the 347,467 recorded in the 2020 Census. The population is 78.6% White, 6.9% Asian, 5.6% Hispanic, 4.4% Black, 3.8% Multiracial, and 0.6% Native American/Other. This demographic dot map shows the population of Hamilton County, with one dot drawn for each person counted by the Census, color-coded by race.

Hamilton has become slightly more racially diverse since the 2020 Census. It is less diverse than Indiana overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Hamilton County, that probability was 36.2% in 2020 and 37.0% in the most recent ACS estimates.

Hamilton County is ranked the 4th most populous county in Indiana, out of 92 counties. Hamilton County was ranked the 4th most populous county in the 2020 Census.

Hamilton County's White Population

287,023 residents of Hamilton County, or 78.6% of the population, identify as White. The share of White residents in Hamilton County is slightly higher than in Indiana overall, where 75.4% of the population is White. Hamilton County ranks 80th statewide in terms of White residents as a share of the population, out of 92 counties.

Since the 2020 Census, Hamilton County's White population has grown by an estimated 4.3%. White residents' share of Hamilton County's population has decreased from 79.2% to 78.6%.

Hamilton County is more White than neighboring Marion County (49.5% White). Hamilton County is less White than neighboring Tipton County (92.8% White), Madison County (82% White), Hancock County (88.1% White), and Howard County (82.6% White).

Hamilton County's Black Population

16,123 residents of Hamilton County, or 4.4% of the population, identify as Black. The share of Black residents in Hamilton County is slightly lower than in Indiana overall, where 9.1% of the population is Black. Hamilton County ranks 19th statewide in terms of Black residents as a share of the population, out of 92 counties.

Since the 2020 Census, Hamilton County's Black population has grown by an estimated 9.9%. Black residents' share of Hamilton County's population has remained roughly unchanged at 4.4%.

Hamilton County is more Black than neighboring Tipton County (1.1% Black), and Hancock County (3.5% Black). Hamilton County is less Black than neighboring Marion County (27.1% Black), Madison County (6.1% Black), and Howard County (7.3% Black).

Hamilton County's Asian Population

25,023 residents of Hamilton County, or 6.9% of the population, identify as Asian. The share of Asian residents in Hamilton County is slightly higher than in Indiana overall, where 2.6% of the population is Asian. Hamilton County ranks 2nd statewide in terms of Asian residents as a share of the population, out of 92 counties.

Since the 2020 Census, Hamilton County's Asian population has grown by an estimated 6.7%. Asian residents' share of Hamilton County's population has remained roughly unchanged at 6.9%.

Hamilton County is more Asian than neighboring Tipton County (0.3% Asian), Marion County (4% Asian), Madison County (0.7% Asian), Hancock County (1.1% Asian), and Howard County (1.4% Asian).

Hamilton County's Hispanic Population

20,577 residents of Hamilton County, or 5.6% of the population, identify as Hispanic. The share of Hispanic residents in Hamilton County is slightly lower than in Indiana overall, where 8.6% of the population is Hispanic. Hamilton County ranks 26th statewide in terms of Hispanic residents as a share of the population, out of 92 counties.

Since the 2020 Census, Hamilton County's Hispanic population has grown by an estimated 13.6%. Hispanic residents' share of Hamilton County's population has remained roughly unchanged at 5.6%.

Hamilton County is more Hispanic than neighboring Tipton County (3.3% Hispanic), Madison County (5.4% Hispanic), Hancock County (3.5% Hispanic), and Howard County (4.1% Hispanic). Hamilton County is less Hispanic than neighboring Marion County (13.8% Hispanic).

Hamilton County's Native American/Other Population

2,296 residents of Hamilton County, or 0.6% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Hamilton County is comparable to the share in Indiana overall, where 0.5% of the population is Native American/Other. Hamilton County ranks 22nd statewide in terms of Native American/Other residents as a share of the population, out of 92 counties.

Since the 2020 Census, Hamilton County's Native American/Other population has grown by an estimated 13.7%. Native American/Other residents' share of Hamilton County's population has remained roughly unchanged at 0.6%.

Hamilton County is more Native American/Other than neighboring Tipton County (0.3% Native American/Other), Madison County (0.4% Native American/Other), Hancock County (0.4% Native American/Other), and Howard County (0.3% Native American/Other). Hamilton County is less Native American/Other than neighboring Marion County (0.7% Native American/Other).

Hamilton County's Multiracial Population

14,014 residents of Hamilton County, or 3.8% of the population, identify as Multiracial. The share of Multiracial residents in Hamilton County is comparable to the share in Indiana overall, where 3.8% of the population is Multiracial. Hamilton County ranks 19th statewide in terms of Multiracial residents as a share of the population, out of 92 counties.

Since the 2020 Census, Hamilton County's Multiracial population has remained roughly the same. Multiracial residents' share of Hamilton County's population has remained roughly unchanged at 3.8%.

Hamilton County is more Multiracial than neighboring Tipton County (2.2% Multiracial), and Hancock County (3.3% Multiracial). Hamilton County is less Multiracial than neighboring Marion County (4.9% Multiracial), Madison County (5.4% Multiracial), and Howard County (4.2% Multiracial).

Sources: Most recent population estimates are from the 2020-2024 American Community Survey 5-Year Estimates. 2020 population counts and map data are from 2020 Census State Redistricting Data. Geographic data are from Census TIGER/Line Shapefiles.