Ohio county populations
88 supported county-equivalent records in Ohio; July 1, 2025 population, 2024–2025 growth and 2025 land-area density.
Population totals use July 1, 2025 observations from PEP Vintage 2025. Change is measured since July 1, 2024. County equivalents are included, including Connecticut planning regions. Missing density is displayed as unavailable, never as zero.
Population table and filters
Whole-dataset downloads| Place | Population · 2025 | Change · 2024–25 | Growth · 2024–25 | People / sq. mi. |
|---|---|---|---|---|
| Franklin CountyOhio · County equivalent · 39049 | 1,361,536 | +8,880 | +0.66% | 2,557.3 |
| Cuyahoga CountyOhio · County equivalent · 39035 | 1,232,925 | -689 | -0.06% | 2,696.5 |
| Hamilton CountyOhio · County equivalent · 39061 | 838,418 | +559 | +0.07% | 2,067.9 |
| Montgomery CountyOhio · County equivalent · 39113 | 539,598 | +2,668 | +0.50% | 1,169.6 |
| Summit CountyOhio · County equivalent · 39153 | 538,376 | +1,431 | +0.27% | 1,304.6 |
| Lucas CountyOhio · County equivalent · 39095 | 423,347 | -908 | -0.21% | 1,246.4 |
| Butler CountyOhio · County equivalent · 39017 | 400,128 | +2,347 | +0.59% | 857.7 |
| Stark CountyOhio · County equivalent · 39151 | 373,771 | +531 | +0.14% | 650.1 |
| Lorain CountyOhio · County equivalent · 39093 | 323,219 | +2,060 | +0.64% | 658.9 |
| Warren CountyOhio · County equivalent · 39165 | 257,181 | +2,142 | +0.84% | 640.7 |
| Delaware CountyOhio · County equivalent · 39041 | 242,032 | +5,169 | +2.18% | 546.2 |
| Lake CountyOhio · County equivalent · 39085 | 232,217 | +77 | +0.03% | 1,012.3 |
| Mahoning CountyOhio · County equivalent · 39099 | 224,706 | -71 | -0.03% | 546.0 |
| Clermont CountyOhio · County equivalent · 39025 | 216,977 | +2,663 | +1.24% | 479.4 |
| Trumbull CountyOhio · County equivalent · 39155 | 198,972 | -842 | -0.42% | 322.2 |
| Licking CountyOhio · County equivalent · 39089 | 185,564 | +1,224 | +0.66% | 271.9 |
| Medina CountyOhio · County equivalent · 39103 | 185,025 | +750 | +0.41% | 439.0 |
| Greene CountyOhio · County equivalent · 39057 | 174,322 | +2,174 | +1.26% | 421.4 |
| Fairfield CountyOhio · County equivalent · 39045 | 169,752 | +2,046 | +1.22% | 336.6 |
| Portage CountyOhio · County equivalent · 39133 | 163,404 | +197 | +0.12% | 335.2 |
| Clark CountyOhio · County equivalent · 39023 | 135,340 | -830 | -0.61% | 341.9 |
| Wood CountyOhio · County equivalent · 39173 | 134,176 | +1,104 | +0.83% | 217.4 |
| Richland CountyOhio · County equivalent · 39139 | 124,893 | -64 | -0.05% | 252.2 |
| Wayne CountyOhio · County equivalent · 39169 | 116,758 | +183 | +0.16% | 210.4 |
| Miami CountyOhio · County equivalent · 39109 | 112,634 | +762 | +0.68% | 277.0 |
| Allen CountyOhio · County equivalent · 39003 | 100,881 | -71 | -0.07% | 250.6 |
| Columbiana CountyOhio · County equivalent · 39029 | 99,377 | -299 | -0.30% | 186.8 |
| Ashtabula CountyOhio · County equivalent · 39007 | 96,713 | -35 | -0.04% | 137.7 |
| Geauga CountyOhio · County equivalent · 39055 | 95,676 | +376 | +0.39% | 238.9 |
| Tuscarawas CountyOhio · County equivalent · 39157 | 92,373 | +141 | +0.15% | 162.7 |
| Muskingum CountyOhio · County equivalent · 39119 | 87,014 | +693 | +0.80% | 130.9 |
| Ross CountyOhio · County equivalent · 39141 | 76,429 | +431 | +0.57% | 110.9 |
| Hancock CountyOhio · County equivalent · 39063 | 75,034 | +273 | +0.37% | 141.2 |
| Union CountyOhio · County equivalent · 39159 | 73,446 | +1,463 | +2.03% | 170.1 |
| Erie CountyOhio · County equivalent · 39043 | 73,296 | -349 | -0.47% | 291.7 |
| Scioto CountyOhio · County equivalent · 39145 | 71,365 | -459 | -0.64% | 117.0 |
| Marion CountyOhio · County equivalent · 39101 | 65,115 | +238 | +0.37% | 161.3 |
| Belmont CountyOhio · County equivalent · 39013 | 64,434 | -330 | -0.51% | 121.1 |
| Knox CountyOhio · County equivalent · 39083 | 64,002 | +438 | +0.69% | 121.8 |
| Jefferson CountyOhio · County equivalent · 39081 | 63,597 | -271 | -0.42% | 155.8 |
| Athens CountyOhio · County equivalent · 39009 | 63,197 | +117 | +0.19% | 125.5 |
| Pickaway CountyOhio · County equivalent · 39129 | 62,978 | +771 | +1.24% | 125.6 |
| Sandusky CountyOhio · County equivalent · 39143 | 58,655 | +4 | +0.01% | 143.7 |
| Washington CountyOhio · County equivalent · 39167 | 58,389 | -210 | -0.36% | 92.4 |
| Huron CountyOhio · County equivalent · 39077 | 58,250 | +22 | +0.04% | 118.3 |
| Lawrence CountyOhio · County equivalent · 39087 | 55,710 | -247 | -0.44% | 122.9 |
| Seneca CountyOhio · County equivalent · 39147 | 54,522 | -172 | -0.31% | 98.9 |
| Ashland CountyOhio · County equivalent · 39005 | 52,523 | +88 | +0.17% | 124.2 |
| Darke CountyOhio · County equivalent · 39037 | 51,520 | +75 | +0.15% | 86.1 |
| Shelby CountyOhio · County equivalent · 39149 | 48,065 | +113 | +0.24% | 117.9 |
Use these comparisons consistently
A larger population does not necessarily mean faster growth. Absolute change measures the number of residents gained or lost; percentage change divides that difference by the starting population. The percentage column here covers one July-to-July interval, rather than a decade or a partial calendar year. Percent growth is suppressed where the starting population is zero.
Density divides the unrounded July 1, 2025 population by matching 2025 Gazetteer land area. It is measured in people per square mile and excludes water area. These geographic averages depend on the size and definition of each unit, so a county’s density is not directly comparable to a built-up city neighborhood.
County-equivalent names and units vary by state. Connecticut planning regions are represented in the current series; linking older county series requires a documented relationship. Incorporated places may cross county boundaries and do not form an exhaustive county breakdown.
Exports contain the current page’s visible rows after filtering, with reference date and release metadata. Use whole-dataset downloads for every row or select a compatible comparison to inspect a longer interval. The initial pep-2025-r1 snapshot remains reproducible when future releases are added.