Ohio Population By County in 2018

Updated on December 2, 2021.

According to the US Census Bureau population estimates, there were 11,680,892 people living in Ohio in 2018. Franklin County was the most populated county with 1,308,599 residents, followed by Cuyahoga County with 1,241,788 residents, and Hamilton County with 815,853 residents. Vinton 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 of each county in Ohio in 2018. The data can also be explored further by sorting and filtering with the table below.

Hover/Click on the counties to see the values.
Ohio Population By County in 2018
See also Population estimate for other years:
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%