Seneca County, Ohio Demographics
Population trends, housing costs, income, commuting, and health, all on one page.
Seneca County, OH Population Density Map and Area Scores
Area Score
Health, income and education, each graded from F to A+. Explore interactive maps for deeper analysis.
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B
Health Around averageHealthier than 72% of counties in Ohio
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C
Income Below average
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D
Education Well below average
Source: Map AI Methodology
Population: density and quick facts
| Metric | Seneca County | Ohio Avg | U.S. Average |
|---|---|---|---|
| Population | 54,770 | 11,799,428 | 337,468,954 |
| Population density (per sq mi) | 99.1 | 263.2 | 86.4 |
| Population growth (%/yr) | -0.21% | 0.23% | 0.59% |
| Median age | 40.3 | 38.5 | 37.3 |
| Households | 22,279 | 4,857,236 | 130,235,071 |
Population in Seneca County declined by 3.4% from 2009 to 2024, reaching 54,770 in 2024.
Population Growth 2009–2024
Race & Ethnicity
Age & Sex
The largest generation in Seneca County is Gen Z, aged 13–28, at 22.9% of residents. That is 2.1 points above Ohio as a whole.
- Gen Z 13–28 12,536 22.9% +2.1 pts
- Millennials 29–44 10,223 18.7% -2.5 pts
- Gen X 45–60 11,367 20.8% +0.6 pts
- Boomers 61–79 9,929 18.1% on par
Residents by birth cohort, from the 2025 age distribution. The right-hand figure is how far each cohort's share sits above or below Ohio, in percentage points. Children younger than Gen Z and the generations before the Boomers are counted in the population but not shown here, so these shares do not add up to 100%.
Male and female share
Women are 49.7% of the people living in Seneca County and men 50.3%.
- Women 49.7% Ohio 50.8%
- Men 50.3% Ohio 49.2%
How many residents match a customer profile?
Residents matching this profile
100% of everyone living in Seneca County
Pick an age range and a women/men split and the figure above answers with how many residents that profile reaches.
Economy
Seneca County has a the economy index of C, which means it is somewhat prosperous.
| Metric | Seneca County | Ohio Avg | U.S. Average |
|---|---|---|---|
| Median household income | $67,059 | $71,509 | $80,455 |
| Income growth (%/yr) | 4.14% | 4.38% | 4.80% |
| Unemployment rate | 3.6% | 4.8% | 5.2% |
The median household income in Seneca County is about 6% lower than in Ohio.
Housing
| Metric | Seneca County | Ohio Avg | U.S. Average |
|---|---|---|---|
| Median home price | $98,763 | $139,044 | $248,835 |
| Median rent | $855 | $1,033 | $1,407 |
| Homeownership rate | 73.4% | 67.2% | 65.2% |
The median home price in Seneca County is about 9.6 years' worth of rent — buying at the median price costs roughly as much as paying the median rent of $855 per month for that long.
Commute Time & Mobility
Commuters in Seneca County spend about 35 minutes on the road round trip each working day. Over a typical 250-day work year, that adds up to roughly 146 hours, about 6.1 full days, spent commuting.
| Metric | Seneca County | Ohio Avg | U.S. Average |
|---|---|---|---|
| One-way commute (min) | 17.6 | 21.1 | 22.4 |
| Round-trip commute (min) | 35.1 | 42.2 | 44.8 |
| Yearly time spent (hours) | 146 | 176 | 187 |
| Estimated yearly cost | $4,534 | $5,447 | $5,790 |
| Work from home | 5.9% | 13.0% | 15.0% |
| Highway traffic (vehicles/day) | 6,609 | 8,648 | 8,813 |
| Local road traffic (vehicles/day) | 673 | 1,212 | 1,355 |
Fastest commutes among counties in
Ohio:
Hancock County (15.3 min), Van Wert County (15.5 min), Mercer County (16.0 min).
Slowest:
Morgan County (32.5 min), Vinton County (32.0 min), Brown County (32.0 min).
The average commute time in Seneca County is 18 minutes, shorter than the 21 minutes in Ohio.
Estimated yearly cost applies a single national wage rule of thumb (U.S. Bureau of Labor Statistics average hourly earnings), not a measurement of wages in this area. Traffic volume figures come from proprietary Ticon and TrafficZoom data.
Education & Households
Seneca County has a education index of D, which means it is barely educated.
| Metric | Seneca County | Ohio Avg | U.S. Average |
|---|---|---|---|
| Bachelor's degree or higher | 17.4% | 28.1% | 31.6% |
| Average household size | 2.34 | 2.37 | 2.53 |
Highest education index among counties in
Ohio:
Delaware County (0.4), Warren County (0.4), Greene County (0.3).
Lowest:
Holmes County (0.1), Vinton County (0.2), Noble County (0.2).
Health
Seneca County has a health index of B, which means it is quite healthy.
| Metric | Seneca County | Ohio Avg | U.S. Average |
|---|---|---|---|
| Life expectancy (years) | 78.4 | 77.0 | 78.3 |
| Self-rated poor health | 16.2% | 17.2% | 16.3% |
| Smokers | 23.8% | 24.3% | 19.0% |
Highest health index among counties in
Ohio:
Delaware County (0.8), Union County (0.8), Warren County (0.8).
Lowest:
Adams County (0.8), Holmes County (0.8), Scioto County (0.8).
Seneca County, OH Compared With Nearby Counties
Seneca County, OH is typical in size for this group, 54,770 residents against a local median of 50,015, so the measures below are close to a like for like comparison. Where Seneca County, OH breaks from the counties next to it is median home price, sitting 15% below the local median of $116,544 at $98,763.
The counties themselves spread $88,031 on median home price, so Seneca County, OH sits at one end of an already wide local range rather than apart from it. Seneca County, OH has the 3rd highest median home price of the 5 areas compared here.
| Area | Population | Median household income | Median home price | Commute |
|---|---|---|---|---|
| Seneca County, OH | 54,770 | $67,059 #3/5 | $98,763 #3/5 | 17.6 min #2/5 |
| Sandusky County, OH | 58,778 | $62,362 | $149,137 | 16.6 min |
| Crawford County, OH | 41,711 | $58,221 | $83,950 | 19.0 min |
| Ottawa County, OH | 39,994 | $76,272 | $65,000 | 21.0 min |
| Huron County, OH | 58,319 | $68,867 | $153,030 | 20.3 min |
Frequently Asked Questions
Common questions about Seneca County, Ohio.
How big is Seneca County, Ohio by population?
About 54,770 people live in Seneca County, Ohio, in 22,279 households of 2.3 people on average. The median age is 40.3, so residents are older than the U.S. median of 37.3 by about 3 years.
Is Seneca County, Ohio mostly urban or rural?
Averaged over its land area, Seneca County, Ohio has 99 people per square mile, a density typical of rural areas. That is close to the U.S. average of 86.
Can a typical household afford a home in Seneca County, Ohio?
The median home costs 1.5 times the median household income ($98,763 against $67,059), compared with 3.1 times nationally. That is within the traditional rule of thumb of about 3 times income. Median rent of $855 a month takes about 15% of the median household's income, below the 30% level at which HUD considers renters cost-burdened.
Is it hard to find a job in Seneca County, Ohio?
Unemployment in Seneca County, Ohio is only 3.6%, well below the U.S. rate of 5.2%, a sign of a tight labor market where employers compete for workers.
How educated are people in Seneca County, Ohio?
17.4% of adults in Seneca County, Ohio hold a bachelor's degree or higher (about 1 in 6), well below the U.S. share of 31.6%.
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