Ohio is a state of the United States.
Boundaries: Natural Earth (naturalearthdata.com), public domain; United States Census Bureau, MAF/TIGER Database (https://www.census.gov/geographies/mapping-files/time-series/geo/carto-boundary-file.html) via geoBoundaries, public domain
| Adams County | West Union | 27 k · 15 subdistricts |
| Allen County | Lima | 102 k · 13 subdistricts |
| Ashland County | Ashland | 52 k · 16 subdistricts |
| Ashtabula County | Jefferson | 98 k · 29 subdistricts |
| Athens County | Athens | 62 k · 14 subdistricts |
| Auglaize County | Wapakoneta | 46 k · 14 subdistricts |
| Belmont County | Saint Clairsville | 66 k · 16 subdistricts |
| Brown County | Georgetown | 44 k · 16 subdistricts |
| Butler County | Hamilton | 390 k · 17 subdistricts |
| Carroll County | Carrollton | 27 k · 14 subdistricts |
| Champaign County | Urbana | 39 k · 12 subdistricts |
| Clark County | Springfield | 136 k · 11 subdistricts |
| Clermont County | Batavia | 209 k · 15 subdistricts |
| Clinton County | Wilmington | 42 k · 14 subdistricts |
| Columbiana County | Lisbon | 102 k · 20 subdistricts |
| Coshocton County | Coshocton | 37 k · 23 subdistricts |
| Crawford County | Bucyrus | 42 k · 18 subdistricts |
| Cuyahoga County | Cleveland | 1.3 M · 58 subdistricts |
| Darke County | Greenville | 52 k · 20 subdistricts |
| Defiance County | Defiance | 38 k · 12 subdistricts |
| Delaware County | Delaware | 214 k · 22 subdistricts |
| Erie County | Sandusky | 76 k · 11 subdistricts |
| Fairfield County | Lancaster | 159 k · 13 subdistricts |
| Fayette County | Washington Court House | 29 k · 11 subdistricts |
| Franklin County | Columbus | 1.3 M · 25 subdistricts |
| Fulton County | Wauseon | 43 k · 12 subdistricts |
| Gallia County | Gallipolis | 29 k · 15 subdistricts |
| Geauga County | Chardon | 95 k · 19 subdistricts |
| Greene County | Xenia | 168 k · 14 subdistricts |
| Guernsey County | Cambridge | 38 k · 19 subdistricts |
| Hamilton County | Cincinnati | 831 k · 43 subdistricts |
| Hancock County | Findlay | 75 k · 19 subdistricts |
| Hardin County | Kenton | 31 k · 15 subdistricts |
| Harrison County | Cadiz | 14 k · 15 subdistricts |
| Henry County | Napoleon | 28 k · 13 subdistricts |
| Highland County | Hillsboro | 43 k · 17 subdistricts |
| Hocking County | Logan | 28 k · 11 subdistricts |
| Holmes County | Millersburg | 44 k · 14 subdistricts |
| Huron County | Norwalk | 59 k · 23 subdistricts |
| Jackson County | Jackson | 33 k · 14 subdistricts |
| Jefferson County | Steubenville | 65 k · 15 subdistricts |
| Knox County | Mount Vernon | 63 k · 24 subdistricts |
| Lake County | Painesville | 233 k · 17 subdistricts |
| Lawrence County | Ironton | 58 k · 14 subdistricts |
| Licking County | Newark | 179 k · 29 subdistricts |
| Logan County | Bellefontaine | 46 k · 17 subdistricts |
| Lorain County | Elyria | 313 k · 28 subdistricts |
| Lucas County | Toledo | 431 k · 16 subdistricts |
| Madison County | London | 44 k · 15 subdistricts |
| Mahoning County | Youngstown | 229 k · 20 subdistricts |
| Marion County | Marion | 65 k · 15 subdistricts |
| Medina County | Medina | 182 k · 26 subdistricts |
| Meigs County | Pomeroy | 22 k · 12 subdistricts |
| Mercer County | Celina | 43 k · 14 subdistricts |
| Miami County | Troy | 109 k · 13 subdistricts |
| Monroe County | Woodsfield | 13 k · 18 subdistricts |
| Montgomery County | Dayton | 537 k · 22 subdistricts |
| Morgan County | McConnelsville | 14 k · 14 subdistricts |
| Morrow County | Mount Gilead | 35 k · 16 subdistricts |
| Muskingum County | Zanesville | 86 k · 26 subdistricts |
| Noble County | Caldwell | 14 k · 15 subdistricts |
| Ottawa County | Port Clinton | 40 k · 13 subdistricts |
| Paulding County | Paulding | 19 k · 12 subdistricts |
| Perry County | New Lexington | 35 k · 14 subdistricts |
| Pickaway County | Circleville | 59 k · 16 subdistricts |
| Pike County | Waverly | 27 k · 14 subdistricts |
| Portage County | Ravenna | 162 k · 27 subdistricts |
| Preble County | Eaton | 41 k · 13 subdistricts |
| Putnam County | Ottawa | 34 k · 15 subdistricts |
| Richland County | Mansfield | 125 k · 18 subdistricts |
| Ross County | Chillicothe | 77 k · 16 subdistricts |
| Sandusky County | Fremont | 59 k · 15 subdistricts |
| Scioto County | Portsmouth | 74 k · 18 subdistricts |
| Seneca County | Tiffin | 55 k · 17 subdistricts |
| Shelby County | Sidney | 48 k · 14 subdistricts |
| Stark County | Canton | 375 k · 21 subdistricts |
| Summit County | Akron | 540 k · 27 subdistricts |
| Trumbull County | Warren | 202 k · 29 subdistricts |
| Tuscarawas County | New Philadelphia | 93 k · 24 subdistricts |
| Union County | Marysville | 63 k · 14 subdistricts |
| Van Wert County | Van Wert | 29 k · 12 subdistricts |
| Vinton County | McArthur | 13 k · 12 subdistricts |
| Warren County | Lebanon | 242 k · 13 subdistricts |
| Washington County | Marietta | 60 k · 24 subdistricts |
| Wayne County | Wooster | 117 k · 18 subdistricts |
| Williams County | Bryan | 37 k · 15 subdistricts |
| Wood County | Bowling Green | 132 k · 23 subdistricts |
| Wyandot County | Upper Sandusky | 22 k · 13 subdistricts |
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