# Lijst van county's in Ohio

De Amerikaanse staat Ohio is onderverdeeld in 88 county's:
| County | Inwoners 1 juli 2007 | Hoofdplaats | Inwoners 1 juli 2007 |
| Adams | 28.160 | West Union | 3081 |
| Allen | 105.233 | Lima | 37.936 |
| Ashland | 54.902 | Ashland | 21.829 |
| Ashtabulla | 101.141 | Jefferson | 3437 |
| Athens | 63.275 | Athens | 21.909 |
| Auglaize | 46.429 | Wapakoneta | 9432 |
| Belmont | 67.908 | St. Clairsville | 5063 |
| Brown | 43.956 | Georgetown | 3506 |
| Butler | 357.888 | Hamilton | 62.285 |
| Carroll | 28.516 | Carrollton | 3208 |
| Champaign | 39.522 | Urbana | 11.408 |
| Clark | 140.477 | Springfield | 62.417 |
| Clermont | 193.490 | Batavia | 1690 |
| Clinton | 43.071 | Wilmington | 12.499 |
| Columbiana | 108.698 | Lisbon | 3011 |
| Coshocton | 36.341 | Coshocton | 11.457 |
| Crawford | 44.227 | Bucyrus | 12.328 |
| Cuyahoga | 1.295.958 | Cleveland | 438.042 |
| Darke | 52.205 | Greenville | 12.845 |
| Defiance | 38.543 | Defiance | 15.998 |
| Delaware | 160.865 | Delaware | 32.986 |
| Erie | 77.323 | Sandusky | 25.861 |
| Fairfield | 141.318 | Lancaster | 36.950 |
| Fayette | 28.308 | Washington Court House | - |
| Franklin | 1.118.107 | Columbus | 747.755 |
| Fulton | 42.562 | Wauseon | 7278 |
| Gallia | 30.841 | Gallipolis | 4174 |
| Geauga | 95.029 | Chardon | 5236 |
| Greene | 154.656 | Xenia | 23.656 |
| Guernsey | 40.409 | Cambridge | 11.280 |
| Hamilton | 842.369 | Cincinnati | 332.458 |
| Hancock | 74.204 | Findlay | 37.492 |
| Hardin | 31.650 | Kenton | 8050 |
| Harrison | 15.506 | Cadiz | 3308 |
| Henry | 28.931 | Napoleon | 8888 |
| Highland | 42.653 | Hillsboro | 6671 |
| Hocking | 28.959 | Logan | 7417 |
| Holmes | 41.369 | Millersburg | 3588 |
| Huron | 59.801 | Norwalk | 16.596 |
| Jackson | 33.314 | Jackson | 6168 |
| Jefferson | 68.730 | Steubenville | 18.864 |
| Knox | 58.961 | Mount Vernon | 15.950 |
| Lake | 233.392 | Painesville | 18.109 |
| Lawrence | 62.609 | Ironton | 11.320 |
| Licking | 156.985 | Newark | 47.176 |
| Logan | 46.279 | Bellefontaine | 12.737 |
| Lorain | 302.260 | Elyria | 55.059 |
| Lucas | 441.910 | Toledo | 295.029 |
| Madison | 41.499 | London | 9545 |
| Mahoning | 240.420 | Youngstown | 73.818 |
| Marion | 65.248 | Marion | 35.686 |
| Medina | 169.832 | Medina | 26.206 |
| Meigs | 22.895 | Pomeroy | 1968 |
| Mercer | 40.888 | Celina | 10.255 |
| Miami | 101.038 | Troy | 22.011 |
| Monroe | 14.258 | Woodsfield | 2429 |
| Montgomery | 538.104 | Dayton | 155.461 |
| Morgan | 14.613 | McConnelsville | 1706 |
| Morrow | 34.520 | Mount Gilead | 3531 |
| Muskingum | 85.333 | Zanesville | 25.116 |
| Noble | 14.096 | Caldwell | 1990 |
| Ottawa | 41.084 | Port Clinton | 6198 |
| Paulding | 19.182 | Paulding | 3367 |
| Perry | 34.839 | New Lexington | 4538 |
| Pickaway | 53.809 | Circleville | 13.648 |
| Pike | 27.918 | Waverly City | 4397 |
| Portage | 155.869 | Ravenna | 11.422 |
| Preble | 41.739 | Eaton | 8042 |
| Putnam | 34.635 | Ottawa | 4428 |
| Richland | 125.679 | Mansfield | 49.675 |
| Ross | 75.398 | Chillicothe | 22.187 |
| Sandusky | 60.997 | Fremont | 16.779 |
| Scioto | 75.958 | Portsmouth | 20.133 |
| Seneca | 56.705 | Tiffin | 17.363 |
| Shelby | 48.834 | Sidney | 20.019 |
| Stark | 378.664 | Canton | 78.319 |
| Summit | 543.487 | Akron | 207.934 |
| Trumbull | 213.475 | Warren | 44.270 |
| Tuscarawas | 91.398 | New Philadelphia | 17.339 |
| Union | 47.234 | Marysville | 17.622 |
| Van Wert | 28.889 | Van Wert | 10.269 |
| Vinton | 13.372 | McArthur | 2034 |
| Warren | 204.390 | Lebanon | 20.416 |
| Washington | 61.576 | Marietta | 14.153 |
| Wayne | 113.554 | Wooster | 26.010 |
| Williams | 38.378 | Bryan | 8299 |
| Wood | 125.399 | Bowling Green | 29.884 |
| Wyandot | 22.471 | Upper Sandusky | 6418 |
* ↑ U.S. Census Bureau: Annual Estimates of the Population for Counties: April 1, 2000 to July 1, 2007
* ↑ U.S. Census Bureau: Population Estimates for All Places: 2000 to 2007
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