Ranking of Ohio Counties By Population in 2018
Updated on June 18, 2025.
Based on the US Census Vintage data estimates, in 2018, the Population for Ohio was 11.68M. Among all Ohio counties, Franklin County had the highest population (1.31M), followed by Cuyahoga County (1.24M), and Hamilton County (815.85K).
The chart below shows the top 10 counties, and the table below shows the ranking of all Ohio counties.
You can see similar ranking information for related topics, and for other states. You can also see the ranking of all counties in the United States.
Related Topics: Ohio Census Vintage Data Topic List.
Data Source: US Census Bureau (Vintage), 2018 Census.
See this for other years:
Ranking of Ohio Counties By Population in 2018
Items per page:
25
0 of 0
| Rank | County | Population |
|---|---|---|
| 1 | Franklin County | 1308599 |
| 2 | Cuyahoga County | 1241788 |
| 3 | Hamilton County | 815853 |
| 4 | Summit County | 541451 |
| 5 | Montgomery County | 531954 |
| 6 | Lucas County | 429990 |
| 7 | Butler County | 382114 |
| 8 | Stark County | 371410 |
| 9 | Lorain County | 309222 |
| 10 | Warren County | 232539 |
| 11 | Lake County | 229856 |
| 12 | Mahoning County | 228975 |
| 13 | Clermont County | 205803 |
| 14 | Delaware County | 205347 |
| 15 | Trumbull County | 198574 |
| 16 | Medina County | 179205 |
| 17 | Licking County | 175816 |
| 18 | Greene County | 167643 |
| 19 | Portage County | 162367 |
| 20 | Fairfield County | 156062 |
| 21 | Clark County | 134697 |
| 22 | Wood County | 130627 |
| 23 | Richland County | 121117 |
| 24 | Wayne County | 115911 |
| 25 | Miami County | 106091 |
| 26 | Allen County | 102747 |
| 27 | Columbiana County | 102534 |
| 28 | Ashtabula County | 97536 |
| 29 | Geauga County | 93770 |
| 30 | Tuscarawas County | 92075 |
| 31 | Muskingum County | 86048 |
| 32 | Ross County | 76859 |
| 33 | Hancock County | 75913 |
| 34 | Scioto County | 75338 |
| 35 | Erie County | 74413 |
| 36 | Belmont County | 67492 |
| 37 | Jefferson County | 65889 |
| 38 | Athens County | 65673 |
| 39 | Marion County | 65426 |
| 40 | Knox County | 61921 |
| 41 | Washington County | 60183 |
| 42 | Lawrence County | 59864 |
| 43 | Sandusky County | 58726 |
| 44 | Huron County | 58316 |
| 45 | Pickaway County | 58099 |
| 46 | Union County | 57836 |
| 47 | Seneca County | 55256 |
| 48 | Ashland County | 53727 |
| 49 | Darke County | 51323 |
| 50 | Shelby County | 48632 |
| 51 | Auglaize County | 45728 |
| 52 | Logan County | 45291 |
| 53 | Madison County | 44393 |
| 54 | Holmes County | 43973 |
| 55 | Brown County | 43623 |
| 56 | Highland County | 43032 |
| 57 | Fulton County | 42256 |
| 58 | Clinton County | 42119 |
| 59 | Crawford County | 41454 |
| 60 | Preble County | 41023 |
| 61 | Mercer County | 40986 |
| 62 | Ottawa County | 40819 |
| 63 | Guernsey County | 39011 |
| 64 | Champaign County | 38799 |
| 65 | Defiance County | 38046 |
| 66 | Williams County | 36753 |
| 67 | Coshocton County | 36607 |
| 68 | Perry County | 36046 |
| 69 | Morrow County | 35133 |
| 70 | Putnam County | 33809 |
| 71 | Jackson County | 32370 |
| 72 | Hardin County | 31417 |
| 73 | Gallia County | 29956 |
| 74 | Fayette County | 28614 |
| 75 | Hocking County | 28353 |
| 76 | Van Wert County | 28176 |
| 77 | Pike County | 27908 |
| 78 | Adams County | 27685 |
| 79 | Carroll County | 27134 |
| 80 | Henry County | 27039 |
| 81 | Meigs County | 23050 |
| 82 | Wyandot County | 21901 |
| 83 | Paulding County | 18747 |
| 84 | Harrison County | 15151 |
| 85 | Morgan County | 14585 |
| 86 | Noble County | 14368 |
| 87 | Monroe County | 13798 |
| 88 | Vinton County | 13132 |