Miami County, OH Demographics
Miami County, OH is the 25th most populous of 88 counties in Ohio, with 108,774 residents across 407 square miles. That is about 268 people per square mile.
At the 2020 census
| Population | 108,774 |
|---|---|
| Land area | 407 sq mi |
| Density | 268 / sq mi |
Data: 2020 Census · American Community Survey 2024
How Miami 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: Miami County, OH
Measured from the county's main population center using 2020 census blocks.
We're computing the drive-time and radius areas around Miami County, OH — check back shortly. Meanwhile you can drop a pin anywhere in the radius tool.
Census tracts in Miami County, OH
| Name | Population | Sq mi | Per sq mi |
|---|---|---|---|
| Census Tract 3801 | 10,409 | 35.1 | 297 |
| Census Tract 3653.01 | 6,066 | 7.2 | 837 |
| Census Tract 3550.01 | 6,051 | 3.1 | 1,951 |
| Census Tract 3653.02 | 6,024 | 7.0 | 858 |
| Census Tract 3151 | 5,763 | 4.2 | 1,381 |
| Census Tract 3650.02 | 5,352 | 10.3 | 519 |
| Census Tract 3651.02 | 5,064 | 11.0 | 460 |
| Census Tract 3501.01 | 5,050 | 14.0 | 360 |
| Census Tract 3153 | 4,936 | 4.5 | 1,086 |
| Census Tract 3450 | 4,893 | 5.0 | 983 |
| Census Tract 3901 | 4,877 | 90.2 | 54 |
| Census Tract 3001 | 4,751 | 26.7 | 178 |
| Census Tract 3401 | 4,713 | 43.6 | 108 |
| Census Tract 3150.02 | 4,403 | 10.9 | 402 |
| Census Tract 3150.01 | 4,148 | 9.9 | 421 |
| Census Tract 3651.01 | 4,049 | 17.6 | 230 |
| Census Tract 3650.01 | 3,715 | 6.5 | 571 |
| Census Tract 3201 | 3,597 | 37.8 | 95 |
| Census Tract 3652 | 3,586 | 2.3 | 1,527 |
| Census Tract 3301 | 3,516 | 41.7 | 84 |
| Census Tract 3501.02 | 3,376 | 9.0 | 374 |
| Census Tract 3250 | 2,798 | 4.5 | 617 |
| Census Tract 3550.02 | 1,637 | 4.2 | 389 |
Related places
Other counties nearby
Nearest counties
Metro areas containing Miami 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.