Ohio Population By County in 2021

Updated on June 16, 2025.

Based on the US Census Vintage data estimates, in 2021, the population of Ohio was 11,767,344. Among all Ohio counties, Franklin had the highest population (1,317,840), followed by Cuyahoga (1,247,735), and Hamilton (827,564).

Hover over or click on the counties in the map below to see the populations. The data can also be found in a table below. You can use the table to sort, filter, and explore the data further.

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).

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Ohio Population By County in 2021

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County	Population	% of State Population
Adams	27589	0.23
Allen	101800	0.87
Ashland	52193	0.44
Ashtabula	97470	0.83
Athens	59090	0.50
Auglaize	46261	0.39
Belmont	65909	0.56
Brown	43708	0.37
Butler	387671	3.29
Carroll	26702	0.23
Champaign	38800	0.33
Clark	135490	1.15
Clermont	209919	1.78
Clinton	42130	0.36
Columbiana	101372	0.86
Coshocton	36674	0.31
Crawford	41793	0.36
Cuyahoga	1247735	10.60
Darke	51655	0.44
Defiance	38182	0.32
Delaware	221304	1.88
Erie	74894	0.64
Fairfield	161245	1.37
Fayette	28935	0.25
Franklin	1317840	11.20
Fulton	42500	0.36
Gallia	29235	0.25
Geauga	95716	0.81
Greene	168250	1.43
Guernsey	38283	0.33
Hamilton	827564	7.03
Hancock	74755	0.64
Hardin	30444	0.26
Harrison	14463	0.12
Henry	27565	0.23
Highland	43453	0.37
Hocking	28109	0.24
Holmes	44367	0.38
Huron	58416	0.50
Jackson	32551	0.28
Jefferson	65101	0.55
Knox	62539	0.53
Lake	232261	1.97
Lawrence	57415	0.49
Licking	180051	1.53
Logan	46160	0.39
Lorain	314301	2.67
Lucas	429535	3.65
Madison	44447	0.38
Mahoning	226559	1.93
Marion	65330	0.56
Medina	183403	1.56
Meigs	22084	0.19
Mercer	42387	0.36
Miami	109426	0.93
Monroe	13339	0.11
Montgomery	536229	4.56
Morgan	13697	0.12
Morrow	35211	0.30
Muskingum	86585	0.74
Noble	14326	0.12
Ottawa	40175	0.34
Paulding	18900	0.16
Perry	35478	0.30
Pickaway	58781	0.50
Pike	27103	0.23
Portage	159086	1.35
Preble	40886	0.35
Putnam	34371	0.29
Richland	125382	1.07
Ross	76526	0.65
Sandusky	58769	0.50
Scioto	72998	0.62
Seneca	54876	0.47
Shelby	48032	0.41
Stark	373861	3.18
Summit	537516	4.57
Trumbull	201594	1.71
Tuscarawas	92631	0.79
Union	65119	0.55
Van Wert	28793	0.25
Vinton	12714	0.11
Warren	246868	2.10
Washington	59504	0.51
Wayne	116160	0.99
Williams	36770	0.31
Wood	130340	1.11
Wyandot	21693	0.18