Seneca County, OH Demographics
Seneca County, OH is the 47th most populous of 88 counties in Ohio, with 55,069 residents across 551 square miles. That is about 100 people per square mile.
At the 2020 census
| Population | 55,069 |
|---|---|
| Land area | 551 sq mi |
| Density | 100 / sq mi |
Data: 2020 Census · American Community Survey 2024
How Seneca County compares to the US
We're computing this county's comparison table — check back shortly. Population, land area, and density above are already exact.
Central Location: Seneca County, OH
Measured from the county's main population center using 2020 census blocks.
We're computing the drive-time and radius areas around Seneca County, OH — check back shortly. Meanwhile you can drop a pin anywhere in the radius tool.
Census tracts in Seneca County, OH
| Name | Population | Sq mi | Per sq mi |
|---|---|---|---|
| Census Tract 9637 | 4,949 | 19.7 | 252 |
| Census Tract 9631 | 4,378 | 99.1 | 44 |
| Census Tract 9634 | 4,253 | 17.8 | 239 |
| Census Tract 9636 | 4,206 | 7.8 | 541 |
| Census Tract 9632 | 4,187 | 18.0 | 232 |
| Census Tract 9633 | 4,055 | 14.2 | 285 |
| Census Tract 9629 | 3,890 | 0.9 | 4,250 |
| Census Tract 9626 | 3,867 | 84.8 | 46 |
| Census Tract 9638 | 3,825 | 88.3 | 43 |
| Census Tract 9625 | 3,724 | 110.3 | 34 |
| Census Tract 9635 | 3,638 | 0.9 | 3,934 |
| Census Tract 9628 | 3,444 | 6.1 | 567 |
| Census Tract 9627 | 3,439 | 76.4 | 45 |
| Census Tract 9630 | 3,214 | 6.8 | 472 |
Related places
Other counties nearby
Nearest counties
Metro areas containing Seneca County
About this page
This page shows demographics for a US county from the 2020 census and the American Community Survey: population, land area, density, urban share, and how the county compares to national averages for income, housing, age, and more.
Counties subdivide into census tracts, listed below with their populations. The drive-time and radius tables measure the population around the county's main population center.