Seneca County Demographics

A map of Seneca County's Population by Race

Seneca County, Ohio had a population of 55,069 in 2020. It was 87.6% White, 2.4% Black, 0.7% Asian, 5.3% Hispanic, 0.5% Native American/Other, and 3.7% Multiracial. This map presents the population of Seneca County, with one dot drawn for each person counted in the 2020 Census, color-coded by race.

Seneca County is the 47th most populous county of the 88 counties in Ohio.

Seneca County's White Population

48,213 residents of Seneca County identify as White, or 87.6%. This makes the White share of the population of Seneca County slightly larger than the White share of the population of Ohio (75.9% White). Of the 88 counties in Ohio, Seneca County is ranked #54 in terms of White residents as a share of the population.

Seneca County is more White than neighboring Sandusky County (81.9% White), and Huron County (87.5% White). Seneca County is less White than neighboring Wyandot County (93.7% White), Crawford County (93.7% White), and Ottawa County (90.3% White).

Seneca County's Black Population

1,314 residents of Seneca County identify as Black, or 2.4%. This makes the Black share of the population of Seneca County slightly less than the Black share of the population of Ohio (12.3% Black). Of the 88 counties in Ohio, Seneca County is ranked #36 in terms of Black residents as a share of the population.

Seneca County is more Black than neighboring Wyandot County (0.4% Black), Crawford County (0.7% Black), Ottawa County (0.8% Black), and Huron County (1% Black). Seneca County is less Black than neighboring Sandusky County (3% Black).

Seneca County's Asian Population

359 residents of Seneca County identify as Asian, or 0.7%. This makes the Asian share of the population of Seneca County roughly similar to the Asian share of the population of Ohio (2.5% Asian). Of the 88 counties in Ohio, Seneca County is ranked #31 in terms of Asian residents as a share of the population.

Seneca County is more Asian than neighboring Sandusky County (0.3% Asian), Wyandot County (0.4% Asian), Crawford County (0.3% Asian), Ottawa County (0.4% Asian), and Huron County (0.4% Asian).

Seneca County's Hispanic Population

2,899 residents of Seneca County identify as Hispanic, or 5.3%. This makes the Hispanic share of the population of Seneca County roughly similar to the Hispanic share of the population of Ohio (4.4% Hispanic). Of the 88 counties in Ohio, Seneca County is ranked #16 in terms of Hispanic residents as a share of the population.

Seneca County is more Hispanic than neighboring Wyandot County (2.9% Hispanic), Crawford County (1.5% Hispanic), and Ottawa County (5.1% Hispanic). Seneca County is less Hispanic than neighboring Sandusky County (10.3% Hispanic), and Huron County (7% Hispanic).

Seneca County's Native American/Other Population

260 residents of Seneca County identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other, or 0.5%. This makes the Native American/Other share of the population of Seneca County roughly similar to the Native American/Other share of the population of Ohio (0.6% Native American/Other). Of the 88 counties in Ohio, Seneca County is ranked #47 in terms of Native American/Other residents as a share of the population.

Seneca County is more Native American/Other than neighboring Sandusky County (0.4% Native American/Other), Wyandot County (0.3% Native American/Other), Crawford County (0.3% Native American/Other), Ottawa County (0.4% Native American/Other), and Huron County (0.4% Native American/Other).

Seneca County's Multiracial Population

2,024 residents of Seneca County identify as Multiracial, or 3.7%. This makes the Multiracial share of the population of Seneca County roughly similar to the Multiracial share of the population of Ohio (4.3% Multiracial). Of the 88 counties in Ohio, Seneca County is ranked #49 in terms of Multiracial residents as a share of the population.

Seneca County is more Multiracial than neighboring Wyandot County (2.3% Multiracial), Crawford County (3.4% Multiracial), and Ottawa County (3.1% Multiracial). Seneca County is less Multiracial than neighboring Sandusky County (4.1% Multiracial), and Huron County (3.8% Multiracial).

Source: 2020 Census State Redistricting Data and Census TIGER/Line Shapefiles.