| population | |
| Adams County | 27477 |
| Allen County | 102206 |
| Ashland County | 52447 |
| Ashtabula County | 97574 |
| Athens County | 62431 |
| Auglaize County | 46442 |
| Belmont County | 66497 |
| Brown County | 43676 |
| Butler County | 390357 |
| Carroll County | 26721 |
| Champaign County | 38714 |
| Clark County | 136001 |
| Clermont County | 208601 |
| Clinton County | 42018 |
| Columbiana County | 101877 |
| Coshocton County | 36612 |
| Crawford County | 42025 |
| Cuyahoga County | 1264817 |
| Darke County | 51881 |
| Defiance County | 38286 |
| Delaware County | 214124 |
| Erie County | 75622 |
| Fairfield County | 158921 |
| Fayette County | 28951 |
| Franklin County | 1321414 |
| Fulton County | 42713 |
| Gallia County | 29220 |
| Geauga County | 95397 |
| Greene County | 167966 |
| Guernsey County | 38438 |
| population | |
| Hamilton County | 830639 |
| Hancock County | 74920 |
| Hardin County | 30696 |
| Harrison County | 14483 |
| Henry County | 27662 |
| Highland County | 43317 |
| Hocking County | 28050 |
| Holmes County | 44271 |
| Huron County | 58565 |
| Jackson County | 32653 |
| Jefferson County | 65249 |
| Knox County | 62721 |
| Lake County | 232603 |
| Lawrence County | 58240 |
| Licking County | 178519 |
| Logan County | 46150 |
| Lorain County | 312964 |
| Lucas County | 431279 |
| Madison County | 43824 |
| Mahoning County | 228614 |
| Marion County | 65359 |
| Medina County | 182470 |
| Meigs County | 22210 |
| Mercer County | 42528 |
| Miami County | 108774 |
| Monroe County | 13385 |
| Montgomery County | 537309 |
| Morgan County | 13802 |
| Morrow County | 34950 |
| Muskingum County | 86410 |
| population | |
| Noble County | 14115 |
| Ottawa County | 40364 |
| Paulding County | 18806 |
| Perry County | 35408 |
| Pickaway County | 58539 |
| Pike County | 27088 |
| Portage County | 161791 |
| Preble County | 40999 |
| Putnam County | 34451 |
| Richland County | 124936 |
| Ross County | 77093 |
| Sandusky County | 58896 |
| Scioto County | 74008 |
| Seneca County | 55069 |
| Shelby County | 48230 |
| Stark County | 374853 |
| Summit County | 540428 |
| Trumbull County | 201977 |
| Tuscarawas County | 93263 |
| Union County | 62784 |
| Van Wert County | 28744 |
| Vinton County | 12800 |
| Warren County | 242337 |
| Washington County | 59711 |
| Wayne County | 116894 |
| Williams County | 37102 |
| Wood County | 132248 |
| Wyandot County | 21900 |
 | The Ohio State University Airport - Don Scott Field | ~ 19.95 km |
| John Glenn Columbus International Airport | ~ 29.53 km |
| Marion Municipal Airport | ~ 41.03 km |
| Rickenbacker International Airport | ~ 48.93 km |
| Galion Municipal Airport | ~ 60.62 km |
| Mansfield Lahm Regional Airport | ~ 75.51 km |
| Springfield-Beckley Municipal Airport | ~ 84.80 km |
| Zanesville Municipal Airport | ~ 100.20 km |
| Lima Allen County Airport | ~ 100.58 km |
