Mercer County, OH Demographics
Mercer County, OH is the 58th most populous of 88 counties in Ohio, with 42,528 residents across 462 square miles. That is about 92 people per square mile.
At the 2020 census
| Population | 42,528 |
|---|---|
| Land area | 462 sq mi |
| Density | 92 / sq mi |
Data: 2020 Census · American Community Survey 2024
How Mercer 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: Mercer County, OH
Measured from the county's main population center using 2020 census blocks.
We're computing the drive-time and radius areas around Mercer County, OH — check back shortly. Meanwhile you can drop a pin anywhere in the radius tool.
Census tracts in Mercer County, OH
| Name | Population | Sq mi | Per sq mi |
|---|---|---|---|
| Census Tract 9679 | 7,333 | 77.0 | 95 |
| Census Tract 9677 | 6,453 | 30.2 | 214 |
| Census Tract 9675 | 5,650 | 10.3 | 551 |
| Census Tract 9680 | 5,076 | 82.8 | 61 |
| Census Tract 9674 | 4,857 | 9.1 | 534 |
| Census Tract 9673 | 4,383 | 137.9 | 32 |
| Census Tract 9672 | 3,662 | 92.4 | 40 |
| Census Tract 9676 | 2,929 | 8.1 | 360 |
| Census Tract 9678 | 2,185 | 14.8 | 148 |
Related places
Other counties nearby
Nearest counties
Metro areas containing Mercer 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.