| County Population Centroids for Ohio |
| ST | COU | COUNTY NAME | POPULATION | LATITUDE | LONGITUDE |
| 39 | 001 | Adams | 27,330 | 38.847361 | -83.514890 |
| 39 | 003 | Allen | 108,473 | 40.757167 | -84.121903 |
| 39 | 005 | Ashland | 52,523 | 40.850931 | -82.287313 |
| 39 | 007 | Ashtabula | 102,728 | 41.799513 | -80.769941 |
| 39 | 009 | Athens | 62,223 | 39.347266 | -82.099312 |
| 39 | 011 | Auglaize | 46,611 | 40.544884 | -84.271436 |
| 39 | 013 | Belmont | 70,226 | 40.040941 | -80.882205 |
| 39 | 015 | Brown | 42,285 | 38.946742 | -83.891775 |
| 39 | 017 | Butler | 332,807 | 39.412504 | -84.504690 |
| 39 | 019 | Carroll | 28,836 | 40.609375 | -81.115193 |
| 39 | 021 | Champaign | 38,890 | 40.120649 | -83.760709 |
| 39 | 023 | Clark | 144,742 | 39.925832 | -83.833101 |
| 39 | 025 | Clermont | 177,977 | 39.102058 | -84.212332 |
| 39 | 027 | Clinton | 40,543 | 39.410357 | -83.839273 |
| 39 | 029 | Columbiana | 112,075 | 40.773426 | -80.727692 |
| 39 | 031 | Coshocton | 36,655 | 40.288837 | -81.861665 |
| 39 | 033 | Crawford | 46,966 | 40.797361 | -82.873269 |
| 39 | 035 | Cuyahoga | 1393978 | 41.453802 | -81.671295 |
| 39 | 037 | Darke | 53,309 | 40.116571 | -84.609897 |
| 39 | 039 | Defiance | 39,500 | 41.294750 | -84.446319 |
| 39 | 041 | Delaware | 109,989 | 40.225132 | -83.013980 |
| 39 | 043 | Erie | 79,551 | 41.407076 | -82.631205 |
| 39 | 045 | Fairfield | 122,759 | 39.786822 | -82.655869 |
| 39 | 047 | Fayette | 28,433 | 39.549649 | -83.446520 |
| 39 | 049 | Franklin | 1068978 | 40.000012 | -82.995652 |
| 39 | 051 | Fulton | 42,084 | 41.578019 | -84.096487 |
| 39 | 053 | Gallia | 31,069 | 38.831049 | -82.269415 |
| 39 | 055 | Geauga | 90,895 | 41.491430 | -81.225582 |
| 39 | 057 | Greene | 147,886 | 39.727319 | -83.994173 |
| 39 | 059 | Guernsey | 40,792 | 40.016785 | -81.544071 |
| 39 | 061 | Hamilton | 845,303 | 39.179006 | -84.506572 |
| 39 | 063 | Hancock | 71,295 | 41.038401 | -83.643304 |
| 39 | 065 | Hardin | 31,945 | 40.688587 | -83.673864 |
| 39 | 067 | Harrison | 15,856 | 40.309609 | -81.051452 |
| 39 | 069 | Henry | 29,210 | 41.358003 | -84.077552 |
| 39 | 071 | Highland | 40,875 | 39.219767 | -83.579207 |
| 39 | 073 | Hocking | 28,241 | 39.521466 | -82.450277 |
| 39 | 075 | Holmes | 38,943 | 40.567037 | -81.876464 |
| 39 | 077 | Huron | 59,487 | 41.172751 | -82.618482 |
| 39 | 079 | Jackson | 32,641 | 39.038775 | -82.609212 |
| 39 | 081 | Jefferson | 73,894 | 40.364660 | -80.692415 |
| 39 | 083 | Knox | 54,500 | 40.400780 | -82.457371 |
| 39 | 085 | Lake | 227,511 | 41.684615 | -81.324834 |
| 39 | 087 | Lawrence | 62,319 | 38.504101 | -82.542319 |
| 39 | 089 | Licking | 145,491 | 40.055925 | -82.499829 |
| 39 | 091 | Logan | 46,005 | 40.387629 | -83.782990 |
| 39 | 093 | Lorain | 284,664 | 41.388793 | -82.119607 |
| 39 | 095 | Lucas | 455,054 | 41.654790 | -83.608547 |
| 39 | 097 | Madison | 40,213 | 39.924283 | -83.383079 |
| 39 | 099 | Mahoning | 257,555 | 41.052213 | -80.694515 |
| 39 | 101 | Marion | 66,217 | 40.582396 | -83.131442 |
| 39 | 103 | Medina | 151,095 | 41.143580 | -81.842393 |
| 39 | 105 | Meigs | 23,072 | 39.057667 | -82.008562 |
| 39 | 107 | Mercer | 40,924 | 40.518786 | -84.607543 |
| 39 | 109 | Miami | 98,868 | 40.048560 | -84.236029 |
| 39 | 111 | Monroe | 15,180 | 39.740293 | -81.064589 |
| 39 | 113 | Montgomery | 559,062 | 39.748899 | -84.207074 |
| 39 | 115 | Morgan | 14,897 | 39.618330 | -81.866825 |
| 39 | 117 | Morrow | 31,628 | 40.522781 | -82.794639 |
| 39 | 119 | Muskingum | 84,585 | 39.959371 | -81.996439 |
| 39 | 121 | Noble | 14,058 | 39.772672 | -81.482304 |
| 39 | 123 | Ottawa | 40,985 | 41.531754 | -83.083036 |
| 39 | 125 | Paulding | 20,293 | 41.132096 | -84.584247 |
| 39 | 127 | Perry | 34,078 | 39.751591 | -82.230539 |
| 39 | 129 | Pickaway | 52,727 | 39.664982 | -82.998549 |
| 39 | 131 | Pike | 27,695 | 39.084822 | -83.035886 |
| 39 | 133 | Portage | 152,061 | 41.177085 | -81.267860 |
| 39 | 135 | Preble | 42,337 | 39.743898 | -84.624268 |
| 39 | 137 | Putnam | 34,726 | 41.009689 | -84.115412 |
| 39 | 139 | Richland | 128,852 | 40.764398 | -82.539348 |
| 39 | 141 | Ross | 73,345 | 39.338475 | -83.016742 |
| 39 | 143 | Sandusky | 61,792 | 41.341687 | -83.103255 |
| 39 | 145 | Scioto | 79,195 | 38.781203 | -82.945557 |
| 39 | 147 | Seneca | 58,683 | 41.128551 | -83.202858 |
| 39 | 149 | Shelby | 47,910 | 40.317032 | -84.190209 |
| 39 | 151 | Stark | 378,098 | 40.834696 | -81.384872 |
| 39 | 153 | Summit | 542,899 | 41.108617 | -81.512911 |
| 39 | 155 | Trumbull | 225,116 | 41.238324 | -80.759633 |
| 39 | 157 | Tuscarawas | 90,914 | 40.477358 | -81.462304 |
| 39 | 159 | Union | 40,909 | 40.262276 | -83.354955 |
| 39 | 161 | Van Wert | 29,659 | 40.855552 | -84.566770 |
| 39 | 163 | Vinton | 12,806 | 39.237334 | -82.497693 |
| 39 | 165 | Warren | 158,383 | 39.431918 | -84.244384 |
| 39 | 167 | Washington | 63,251 | 39.412704 | -81.509086 |
| 39 | 169 | Wayne | 111,564 | 40.839872 | -81.863684 |
| 39 | 171 | Williams | 39,188 | 41.534905 | -84.573680 |
| 39 | 173 | Wood | 121,065 | 41.445922 | -83.597736 |
| 39 | 175 | Wyandot | 22,908 | 40.867466 | -83.300366 |
