Union County Demographics

A map of Union County's Population by Race

Union County, Ohio has an estimated population of 67,324, an increase from the 62,784 recorded in the 2020 Census. The population is 84.5% White, 5.0% Asian, 4.2% Multiracial, 3.4% Hispanic, 2.3% Black, and 0.6% Native American/Other. This demographic dot map shows the population of Union County, with one dot drawn for each person counted by the Census, color-coded by race.

Union has become slightly more racially diverse since the 2020 Census. It is considerably less 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 Union County, that probability was 27.3% in 2020 and 27.9% in the most recent ACS estimates.

Union County is ranked the 36th most populous county in Ohio, out of 88 counties. Union County was ranked the 39th most populous county in the 2020 Census.

Union County's White Population

56,920 residents of Union County, or 84.5% of the population, identify as White. The share of White residents in Union County is higher than in Ohio overall, where 75.8% of the population is White. Union County ranks 66th statewide in terms of White residents as a share of the population, out of 88 counties.

Since the 2020 Census, Union County's White population has grown by an estimated 6.8%. White residents' share of Union County's population has remained roughly unchanged at 84.5%.

Union County is more White than neighboring Delaware County (79.2% White). Union County is less White than neighboring Marion County (86.3% White), Logan County (91.5% White), Madison County (86.2% White), and Champaign County (91.7% White).

Union County's Black Population

1,537 residents of Union County, or 2.3% of the population, identify as Black. The share of Black residents in Union County is lower than in Ohio overall, where 12% of the population is Black. Union County ranks 41st statewide in terms of Black residents as a share of the population, out of 88 counties.

Since the 2020 Census, Union County's Black population has grown by an estimated 20.5%. Black residents' share of Union County's population has remained roughly unchanged at 2.3%.

Union County is more Black than neighboring Logan County (1.7% Black), and Champaign County (1.6% Black). Union County is less Black than neighboring Marion County (4.7% Black), Delaware County (4.3% Black), and Madison County (4.3% Black).

Union County's Asian Population

3,375 residents of Union County, or 5.0% of the population, identify as Asian. The share of Asian residents in Union County is slightly higher than in Ohio overall, where 2.5% of the population is Asian. Union County ranks 3rd statewide in terms of Asian residents as a share of the population, out of 88 counties.

Since the 2020 Census, Union County's Asian population has declined by an estimated 16.5%. Asian residents' share of Union County's population has decreased from 6.4% to 5.0%.

Union County is more Asian than neighboring Marion County (0.6% Asian), Logan County (0.5% Asian), Madison County (1.3% Asian), and Champaign County (0.5% Asian). Union County is less Asian than neighboring Delaware County (8.6% Asian).

Union County's Hispanic Population

2,260 residents of Union County, or 3.4% of the population, identify as Hispanic. The share of Hispanic residents in Union County is comparable to the share in Ohio overall, where 4.8% of the population is Hispanic. Union County ranks 38th statewide in terms of Hispanic residents as a share of the population, out of 88 counties.

Since the 2020 Census, Union County's Hispanic population has grown by an estimated 47.3%. Hispanic residents' share of Union County's population has increased from 2.4% to 3.4%.

Union County is more Hispanic than neighboring Marion County (3.2% Hispanic), Logan County (2.4% Hispanic), Madison County (3.1% Hispanic), and Champaign County (1.8% Hispanic). Union County is less Hispanic than neighboring Delaware County (3.5% Hispanic).

Union County's Native American/Other Population

413 residents of Union 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 Union County is comparable to the share in Ohio overall, where 0.5% of the population is Native American/Other. Union County ranks 49th statewide in terms of Native American/Other residents as a share of the population, out of 88 counties.

Since the 2020 Census, Union County's Native American/Other population has grown by an estimated 40.5%. Native American/Other residents' share of Union County's population has remained roughly unchanged at 0.6%.

Union County is more Native American/Other than neighboring Delaware County (0.5% Native American/Other), and Logan County (0.3% Native American/Other). Union County is less Native American/Other than neighboring Champaign County (0.7% Native American/Other).

Union County's Multiracial Population

2,819 residents of Union County, or 4.2% of the population, identify as Multiracial. The share of Multiracial residents in Union County is comparable to the share in Ohio overall, where 4.3% of the population is Multiracial. Union County ranks 46th statewide in terms of Multiracial residents as a share of the population, out of 88 counties.

Since the 2020 Census, Union County's Multiracial population has grown by an estimated 19.9%. Multiracial residents' share of Union County's population has increased from 3.7% to 4.2%.

Union County is more Multiracial than neighboring Delaware County (4% Multiracial), Logan County (3.7% Multiracial), and Champaign County (3.6% Multiracial). Union County is less Multiracial than neighboring Marion County (4.6% Multiracial), and Madison County (4.5% 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.