Demographics of Seneca County, Ohio

Seneca County, Ohio had 54,522 people on July 1, 2025, by the Census Bureau’s estimate: −539 since July 2020. Age, income, poverty, housing and origin below come from the American Community Survey, averaged over 2020–2024, each with its margin of error.

Seneca County, in four figures

54,522
Population: July 1, 2025, Vintage 2025 estimate.; −1.0%
Change since July 2020: −539 people.; 40.2 ±0.4
Median age: ACS 2020–⁠2024.; $66,025 ±$3,286
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. Each year's change is births less deaths, net moves from abroad and net moves from elsewhere in the country, with the Bureau's small residual. The 2020 row's components run 3 months, from the April census to July 1.

Seneca County, Ohio's population shrank 1.0% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Seneca County, Ohio's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).

U.S. Census Bureau — Census Bureau population estimates — counties and Puerto Rico municipios, with components of change

About this chart

The figures

Seneca County, Ohio's population shrank 1.0% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Seneca County, Ohio's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).
July 1	Population	Index	United States
2020	55,061	100.0	100.0
2021	54,975	99.8	100.2
2022	54,650	99.3	100.7
2023	54,719	99.4	101.6
2024	54,694	99.3	102.5
2025	54,522	99.0	103.1

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Population of Seneca County, Ohio on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	55,061	−19	−16	0	−17
2021	54,975	−86	−173	+20	+16
2022	54,650	−325	−169	+86	−215
2023	54,719	+69	−40	+107	+17
2024	54,694	−25	−85	+84	−17
2025	54,522	−172	−89	+45	−131

Age, 2020–2024

The median age is 40.2 ±0.4: for men 38.8 ±0.7 and for women 41.4 ±0.7. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Seneca County by age, ACS 2020–2024
Age	People	Share	Ohio	United States
Under 5	2,980 ±65	5.4% ±0.1	5.7% ±<0.1	5.6% ±<0.1
5 to 17	8,748 ±388	16.0% ±0.7	16.3% ±0.1	16.3% ±<0.1
18 to 24	5,885 ±388	10.7% ±0.7	8.9% ±0.1	9.1% ±<0.1
25 to 44	12,861 ±462	23.5% ±0.8	25.7% ±0.1	26.9% ±<0.1
45 to 64	13,758 ±452	25.1% ±0.8	25.1% ±0.1	24.8% ±<0.1
65 and over	10,538 ±528	19.2% ±1.0	18.3% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $66,025 ±$3,286, and income per person $33,984 ±$1,330, in 2024 dollars. The median is $71,389 ±$321 in Ohio and $80,734 ±$166 in the United States.

Households by income

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Households in Seneca County by income, ACS 2020–2024
Household income	Households	Share	Ohio	United States
Under $25,000	3,652 ±421	16.4% ±1.9	16.3% ±0.2	14.6% ±<0.1
$25,000 to $49,999	4,657 ±478	20.9% ±2.1	19.1% ±0.2	16.7% ±<0.1
$50,000 to $74,999	4,236 ±431	19.0% ±1.9	16.9% ±0.1	15.5% ±<0.1
$75,000 to $99,999	3,444 ±378	15.5% ±1.7	13.1% ±0.1	12.6% ±<0.1
$100,000 to $149,999	4,006 ±362	18.0% ±1.6	17.1% ±0.1	17.5% ±<0.1
$150,000 to $199,999	1,198 ±178	5.4% ±0.8	8.3% ±0.1	9.6% ±<0.1
$200,000 or more	1,086 ±180	4.9% ±0.8	9.1% ±0.1	13.4% ±0.1

Poverty by age

The poverty rate is the share of people whose family income is below the federal threshold for their family’s size, of everyone for whom the Bureau determines it (B17020).

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Poverty rate in Seneca County by age, ACS 2020–2024
Age	Below poverty	Rate	Ohio	United States
All ages	6,195 ±642	11.9% ±1.2	13.3% ±0.2	12.5% ±0.1
Under 18	1,678 ±340	14.7% ±2.9	17.8% ±0.3	16.1% ±0.1
18 to 59	3,222 ±440	12.0% ±1.6	12.7% ±0.2	11.6% ±0.1
60 and over	1,295 ±227	9.5% ±1.6	10.6% ±0.2	11.0% ±<0.1

Housing, 2020–2024

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Housing in Seneca County, ACS 2020–2024
Measure	Seneca County	Ohio	United States
Housing units	23,982 ±111	5,292,391 ±464	143,775,355 ±10,234
Occupied	92.9% ±1.4	91.9% ±0.2	89.9% ±0.1
Vacant	7.1% ±1.3	8.1% ±0.2	10.1% ±0.1
Owner occupied	73.4% ±1.7	67.2% ±0.3	65.2% ±0.3
Renter occupied	26.6% ±2.0	32.8% ±0.2	34.8% ±0.1
Median home value	$154,700 ±$3,665	$214,800 ±$742	$332,700 ±$236
Median gross rent	$856 ±$20	$1,034 ±$5	$1,413 ±$2
Median year built	1959 ±2	1970 ±1	1980 ±1

Occupied and vacant are shares of all housing units; owner and renter occupied are shares of occupied units. Value and rent are medians in 2024 dollars.

Origin and place of birth, 2020–2024

Hispanic or Latino origin is not a race in the Census Bureau’s tables. Here the people of Hispanic origin, of any race, are one row, and everyone else is counted by race alone (B03002), so the rows add to the whole.

Hispanic origin and race

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People in Seneca County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Ohio	United States
Hispanic or Latino	3,123 ±0	5.7% ±<0.1	4.8% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	48,097 ±159	87.8% ±0.3	75.8% ±<0.1	57.4% ±<0.1
Black alone, not Hispanic	1,299 ±234	2.4% ±0.4	12.0% ±<0.1	11.9% ±<0.1
Asian alone, not Hispanic	288 ±110	0.5% ±0.2	2.5% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	37 to 147	0.1% to 0.3%	0.1% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 34	0% to 0.1%	< 0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	84 to 326	0.2% to 0.6%	0.4% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	1,654 ±299	3.0% ±0.5	4.3% ±0.1	4.3% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Place of birth and citizenship

“Born a citizen outside the states” counts people born in Puerto Rico, the island areas, or abroad to American parents. Naturalized citizens and those who are not citizens together make up the people born abroad (B05002).

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People in Seneca County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Ohio	United States
Born in the state	48,156 ±521	87.9% ±1.0	74.6% ±0.1	57.3% ±<0.1
Born in another state	5,895 ±520	10.8% ±0.9	19.2% ±0.1	26.9% ±<0.1
Born a citizen outside the states	17 to 87	< 0.1% to 0.2%	1.0% ±<0.1	1.7% ±<0.1
Born abroad	667 ±179	1.2% ±0.3	5.2% ±0.1	14.1% ±<0.1
Naturalized citizens	264 ±104	0.5% ±0.2	2.8% ±<0.1	7.4% ±<0.1
Not citizens	403 ±154	0.7% ±0.3	2.5% ±0.1	6.8% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Seneca County among the counties of Ohio

47th of 88 by population, July 2025. Every one is listed on the Ohio page.

Counties of Ohio near Seneca County in population, July 2025
County	July 2025	Change since 2020
Pickaway County	62,978	+7.4%
Sandusky County	58,655	−0.4%
Washington County	58,389	−2.1%
Huron County	58,250	−0.4%
Lawrence County	55,710	−4.2%
Seneca County	54,522	−1.0%
Ashland County	52,523	+0.1%
Darke County	51,520	−0.7%
Shelby County	48,065	−0.2%
Madison County	46,985	+7.1%
Logan County	46,302	+0.4%

Elsewhere on the site

Sources

Census Bureau population estimates — counties and Puerto Rico municipios, with components of change — U.S. Census Bureau · U.S. Government work · retrieved September 25, 2026
American Community Survey 5-year estimates — table-based Summary File · U.S. Government work

Data retrieved September 25, 2026