Ohio Population By County in 2018
Updated on January 27, 2024.
According to the US Census Bureau population estimates, there were 11,680,892 people living in Ohio in 2018. Franklin[object Promise] County was the most populated county with 1,308,599 residents, followed by Cuyahoga[object Promise] County with 1,241,788 residents, and Hamilton[object Promise] County with 815,853 residents. Vinton[object Promise] County with a population of 13,132 was the least populated county in Ohio in 2018.
Use the map below to interactively explore the population for each county in Ohio in 2018. The data can also be explored further by sorting and filtering with the table below.
You can see similar information for other states and by state for the United States.
Related Topics: Ohio Census Vintage Data Topic List.
Data Source: US Census Bureau (Vintage).
See this for other years:
Ohio Population By County in 2018
Table of Ohio Population By County in 2018
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| County | Population | % of State Population |
|---|---|---|
| Adams | 27,685 | 0.24% |
| Allen | 102,747 | 0.88% |
| Ashland | 53,727 | 0.46% |
| Ashtabula | 97,536 | 0.84% |
| Athens | 65,673 | 0.56% |
| Auglaize | 45,728 | 0.39% |
| Belmont | 67,492 | 0.58% |
| Brown | 43,623 | 0.37% |
| Butler | 382,114 | 3.27% |
| Carroll | 27,134 | 0.23% |
| Champaign | 38,799 | 0.33% |
| Clark | 134,697 | 1.15% |
| Clermont | 205,803 | 1.76% |
| Clinton | 42,119 | 0.36% |
| Columbiana | 102,534 | 0.88% |
| Coshocton | 36,607 | 0.31% |
| Crawford | 41,454 | 0.36% |
| Cuyahoga | 1,241,788 | 10.63% |
| Darke | 51,323 | 0.44% |
| Defiance | 38,046 | 0.33% |
| Delaware | 205,347 | 1.76% |
| Erie | 74,413 | 0.64% |
| Fairfield | 156,062 | 1.34% |
| Fayette | 28,614 | 0.25% |
| Franklin | 1,308,599 | 11.20% |
| Fulton | 42,256 | 0.36% |
| Gallia | 29,956 | 0.26% |
| Geauga | 93,770 | 0.80% |
| Greene | 167,643 | 1.44% |
| Guernsey | 39,011 | 0.33% |
| Hamilton | 815,853 | 6.99% |
| Hancock | 75,913 | 0.65% |
| Hardin | 31,417 | 0.27% |
| Harrison | 15,151 | 0.13% |
| Henry | 27,039 | 0.23% |
| Highland | 43,032 | 0.37% |
| Hocking | 28,353 | 0.24% |
| Holmes | 43,973 | 0.38% |
| Huron | 58,316 | 0.50% |
| Jackson | 32,370 | 0.28% |
| Jefferson | 65,889 | 0.56% |
| Knox | 61,921 | 0.53% |
| Lake | 229,856 | 1.97% |
| Lawrence | 59,864 | 0.51% |
| Licking | 175,816 | 1.51% |
| Logan | 45,291 | 0.39% |
| Lorain | 309,222 | 2.65% |
| Lucas | 429,990 | 3.68% |
| Madison | 44,393 | 0.38% |
| Mahoning | 228,975 | 1.96% |
| Marion | 65,426 | 0.56% |
| Medina | 179,205 | 1.53% |
| Meigs | 23,050 | 0.20% |
| Mercer | 40,986 | 0.35% |
| Miami | 106,091 | 0.91% |
| Monroe | 13,798 | 0.12% |
| Montgomery | 531,954 | 4.55% |
| Morgan | 14,585 | 0.13% |
| Morrow | 35,133 | 0.30% |
| Muskingum | 86,048 | 0.74% |
| Noble | 14,368 | 0.12% |
| Ottawa | 40,819 | 0.35% |
| Paulding | 18,747 | 0.16% |
| Perry | 36,046 | 0.31% |
| Pickaway | 58,099 | 0.50% |
| Pike | 27,908 | 0.24% |
| Portage | 162,367 | 1.39% |
| Preble | 41,023 | 0.35% |
| Putnam | 33,809 | 0.29% |
| Richland | 121,117 | 1.04% |
| Ross | 76,859 | 0.66% |
| Sandusky | 58,726 | 0.50% |
| Scioto | 75,338 | 0.65% |
| Seneca | 55,256 | 0.47% |
| Shelby | 48,632 | 0.42% |
| Stark | 371,410 | 3.18% |
| Summit | 541,451 | 4.64% |
| Trumbull | 198,574 | 1.70% |
| Tuscarawas | 92,075 | 0.79% |
| Union | 57,836 | 0.50% |
| Van Wert | 28,176 | 0.24% |
| Vinton | 13,132 | 0.11% |
| Warren | 232,539 | 1.99% |
| Washington | 60,183 | 0.52% |
| Wayne | 115,911 | 0.99% |
| Williams | 36,753 | 0.32% |
| Wood | 130,627 | 1.12% |
| Wyandot | 21,901 | 0.19% |