Marion County Demographics

A map of Marion County's Population by Race

Marion County, Ohio has an estimated population of 65,020, a less than 1% change from the 65,359 recorded in the 2020 Census. The population is 86.3% White, 4.7% Black, 4.6% Multiracial, 3.2% Hispanic, 0.6% Asian, and 0.6% Native American/Other. This demographic dot map shows the population of Marion County, with one dot drawn for each person counted by the Census, color-coded by race.

Marion has become slightly less 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 Marion County, that probability was 25.7% in 2020 and 25.1% in the most recent ACS estimates.

Marion County is ranked the 38th most populous county in Ohio, out of 88 counties. Marion County was ranked the 37th most populous county in the 2020 Census.

Marion County's White Population

56,085 residents of Marion County, or 86.3% of the population, identify as White. The share of White residents in Marion County is considerably higher than in Ohio overall, where 75.8% of the population is White. Marion County ranks 62nd statewide in terms of White residents as a share of the population, out of 88 counties.

Since the 2020 Census, Marion County's White population has remained roughly the same. White residents' share of Marion County's population has remained roughly unchanged at 86.3%.

Marion County is more White than neighboring Delaware County (79.2% White), and Union County (84.5% White). Marion County is less White than neighboring Wyandot County (94.1% White), Crawford County (94% White), and Morrow County (93.7% White).

Marion County's Black Population

3,035 residents of Marion County, or 4.7% of the population, identify as Black. The share of Black residents in Marion County is lower than in Ohio overall, where 12% of the population is Black. Marion County ranks 18th statewide in terms of Black residents as a share of the population, out of 88 counties.

Since the 2020 Census, Marion County's Black population has declined by an estimated 25.1%. Black residents' share of Marion County's population has decreased from 6.2% to 4.7%.

Marion County is more Black than neighboring Wyandot County (0.2% Black), Delaware County (4.3% Black), Union County (2.3% Black), Crawford County (0.7% Black), and Morrow County (0.4% Black).

Marion County's Asian Population

395 residents of Marion County, or 0.6% of the population, identify as Asian. The share of Asian residents in Marion County is comparable to the share in Ohio overall, where 2.5% of the population is Asian. Marion County ranks 39th statewide in terms of Asian residents as a share of the population, out of 88 counties.

Since the 2020 Census, Marion County's Asian population has grown by an estimated 10.3%. Asian residents' share of Marion County's population has remained roughly unchanged at 0.6%.

Marion County is more Asian than neighboring Wyandot County (0% Asian), and Morrow County (0.4% Asian). Marion County is less Asian than neighboring Delaware County (8.6% Asian), Union County (5% Asian), and Crawford County (0.8% Asian).

Marion County's Hispanic Population

2,098 residents of Marion County, or 3.2% of the population, identify as Hispanic. The share of Hispanic residents in Marion County is comparable to the share in Ohio overall, where 4.8% of the population is Hispanic. Marion County ranks 31st statewide in terms of Hispanic residents as a share of the population, out of 88 counties.

Since the 2020 Census, Marion County's Hispanic population has grown by an estimated 7.3%. Hispanic residents' share of Marion County's population has remained roughly unchanged at 3.2%.

Marion County is more Hispanic than neighboring Wyandot County (3.1% Hispanic), Crawford County (1.8% Hispanic), and Morrow County (1.9% Hispanic). Marion County is less Hispanic than neighboring Delaware County (3.5% Hispanic), and Union County (3.4% Hispanic).

Marion County's Native American/Other Population

413 residents of Marion 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 Marion County is comparable to the share in Ohio overall, where 0.5% of the population is Native American/Other. Marion County ranks 37th statewide in terms of Native American/Other residents as a share of the population, out of 88 counties.

Since the 2020 Census, Marion County's Native American/Other population has grown by an estimated 28.3%. Native American/Other residents' share of Marion County's population has remained roughly unchanged at 0.6%.

Marion County is more Native American/Other than neighboring Wyandot County (0.2% Native American/Other), Delaware County (0.5% Native American/Other), Crawford County (0.1% Native American/Other), and Morrow County (0.3% Native American/Other).

Marion County's Multiracial Population

2,994 residents of Marion County, or 4.6% of the population, identify as Multiracial. The share of Multiracial residents in Marion County is comparable to the share in Ohio overall, where 4.3% of the population is Multiracial. Marion County ranks 35th statewide in terms of Multiracial residents as a share of the population, out of 88 counties.

Since the 2020 Census, Marion County's Multiracial population has grown by an estimated 17.0%. Multiracial residents' share of Marion County's population has increased from 3.9% to 4.6%.

Marion County is more Multiracial than neighboring Wyandot County (2.4% Multiracial), Delaware County (4% Multiracial), Union County (4.2% Multiracial), Crawford County (2.5% Multiracial), and Morrow County (3.2% 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.