Hamilton County Demographics

A map of Hamilton County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	517,650	519,734	62.3%	62.6%
Black	198,910	207,764	23.9%	25.0%
Multiracial	44,989	35,981	5.4%	4.3%
Hispanic	39,995	36,250	4.8%	4.4%
Asian	22,401	25,160	2.7%	3.0%
Native American/Other	6,829	5,750	0.8%	0.7%

Hamilton County, Ohio has an estimated population of 830,774, a less than 1% change from the 830,639 recorded in the 2020 Census. The population is 62.3% White, 23.9% Black, 5.4% Multiracial, 4.8% Hispanic, 2.7% Asian, and 0.8% 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 considerably more diverse than Ohio 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 54.1% in 2020 and 54.8% in the most recent ACS estimates.

Hamilton County is ranked the 3rd most populous county in Ohio, out of 88 counties. Hamilton County was ranked the 3rd most populous county in the 2020 Census.

Hamilton County's White Population

517,650 residents of Hamilton County, or 62.3% of the population, identify as White. The share of White residents in Hamilton County is considerably lower than in Ohio overall, where 75.8% of the population is White. Hamilton County ranks 86th statewide in terms of White residents as a share of the population, out of 88 counties.

Since the 2020 Census, Hamilton County's White population has remained roughly the same. White residents' share of Hamilton County's population has remained roughly unchanged at 62.3%.

Hamilton County is less White than neighboring Butler County (74.6% White), Kenton County (85.2% White), Boone County (82.3% White), Campbell County (90.3% White), and Clermont County (90.6% White).

Hamilton County's Black Population

198,910 residents of Hamilton County, or 23.9% of the population, identify as Black. The share of Black residents in Hamilton County is considerably higher than in Ohio overall, where 12% of the population is Black. Hamilton County ranks 2nd statewide in terms of Black residents as a share of the population, out of 88 counties.

Since the 2020 Census, Hamilton County's Black population has declined by an estimated 4.3%. Black residents' share of Hamilton County's population has decreased from 25.0% to 23.9%.

Hamilton County is more Black than neighboring Butler County (8.3% Black), Kenton County (3.9% Black), Boone County (4.4% Black), Campbell County (2.8% Black), and Clermont County (1.5% Black).

Hamilton County's Asian Population

22,401 residents of Hamilton County, or 2.7% of the population, identify as Asian. The share of Asian residents in Hamilton County is comparable to the share in Ohio overall, where 2.5% of the population is Asian. Hamilton County ranks 9th statewide in terms of Asian residents as a share of the population, out of 88 counties.

Since the 2020 Census, Hamilton County's Asian population has declined by an estimated 11.0%. Asian residents' share of Hamilton County's population has remained roughly unchanged at 2.7%.

Hamilton County is more Asian than neighboring Kenton County (1.1% Asian), Boone County (2.4% Asian), Campbell County (0.9% Asian), and Clermont County (1.1% Asian). Hamilton County is less Asian than neighboring Butler County (4.3% Asian).

Hamilton County's Hispanic Population

39,995 residents of Hamilton County, or 4.8% of the population, identify as Hispanic. The share of Hispanic residents in Hamilton County is comparable to the share in Ohio overall, where 4.8% of the population is Hispanic. Hamilton County ranks 21st statewide in terms of Hispanic residents as a share of the population, out of 88 counties.

Since the 2020 Census, Hamilton County's Hispanic population has grown by an estimated 10.3%. Hispanic residents' share of Hamilton County's population has remained roughly unchanged at 4.8%.

Hamilton County is more Hispanic than neighboring Campbell County (2.6% Hispanic), and Clermont County (2.6% Hispanic). Hamilton County is less Hispanic than neighboring Butler County (7% Hispanic), Kenton County (4.9% Hispanic), and Boone County (5.9% Hispanic).

Hamilton County's Native American/Other Population

6,829 residents of Hamilton County, or 0.8% 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 Ohio overall, where 0.5% of the population is Native American/Other. Hamilton County ranks 8th statewide in terms of Native American/Other residents as a share of the population, out of 88 counties.

Since the 2020 Census, Hamilton County's Native American/Other population has grown by an estimated 18.8%. Native American/Other residents' share of Hamilton County's population has remained roughly unchanged at 0.8%.

Hamilton County is more Native American/Other than neighboring Butler County (0.6% Native American/Other), Kenton County (0.5% Native American/Other), Campbell County (0.4% Native American/Other), and Clermont County (0.6% Native American/Other).

Hamilton County's Multiracial Population

44,989 residents of Hamilton County, or 5.4% of the population, identify as Multiracial. The share of Multiracial residents in Hamilton County is comparable to the share in Ohio overall, where 4.3% of the population is Multiracial. Hamilton County ranks 25th statewide in terms of Multiracial residents as a share of the population, out of 88 counties.

Since the 2020 Census, Hamilton County's Multiracial population has grown by an estimated 25.0%. Multiracial residents' share of Hamilton County's population has increased from 4.3% to 5.4%.

Hamilton County is more Multiracial than neighboring Butler County (5.3% Multiracial), Kenton County (4.4% Multiracial), Boone County (4.2% Multiracial), Campbell County (2.9% Multiracial), and Clermont County (3.6% 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.