Ohio Voting-age Population By County in 2021 (ACS-5Yrs)

Updated on February 28, 2025.

Based on the US Census ACS-5Yrs estimates, in 2021, the voting-age population of Ohio was 9.14M which was 77.66% of the total Ohio population. Among all Ohio counties, Franklin had the highest voting-age population (1.01M), followed by Cuyahoga (1.00M), and Hamilton (635.50K).

On the other hand, the counties with the least voting-age population were: Vinton (10.00K), Monroe (10.73K), and Morgan (11.00K).

The chart and table below shows the voting-age population of each county and the percentage of each county's population that are of voting-age.

You can see similar information for other states and by state for the United States.

Related Topics: Ohio ACS-5Yrs Estimates, 2021 Topic List.

Data Source: US Census - ACS 5-Year Estimates, 2021 Census.

Ohio Voting-age Population By County in 2021

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County	Voting-age Population	% of County Population
Adams	20894	75.80
Allen	78607	76.72
Ashland	40763	77.41
Ashtabula	76108	77.77
Athens	53760	85.42
Auglaize	35037	75.70
Belmont	54321	80.98
Brown	33622	76.95
Butler	296271	76.39
Carroll	21322	79.36
Champaign	30052	77.70
Clark	105252	77.37
Clermont	159866	76.99
Clinton	32305	76.83
Columbiana	81373	79.52
Coshocton	27911	76.22
Crawford	32717	78.01
Cuyahoga	1000135	79.15
Darke	39395	76.00
Defiance	29494	76.95
Delaware	155942	73.86
Erie	60081	79.51
Fairfield	119534	75.84
Fayette	22026	76.22
Franklin	1005778	76.57
Fulton	32602	76.33
Gallia	22576	76.87
Geauga	73525	77.06
Greene	132303	79.20
Guernsey	30015	77.88
Hamilton	635504	76.86
Hancock	58377	77.69
Hardin	23829	77.52
Harrison	11514	78.74
Henry	21122	76.48
Highland	32772	75.93
Hocking	22001	78.07
Holmes	30431	68.90
Huron	44417	75.82
Jackson	24758	76.11
Jefferson	52755	80.40
Knox	48030	76.97
Lake	185686	79.97
Lawrence	45654	77.95
Licking	136147	76.72
Logan	35353	76.86
Lorain	242827	77.90
Lucas	331142	76.79
Madison	34920	79.46
Mahoning	182538	79.70
Marion	51584	78.74
Medina	141014	77.72
Meigs	17307	77.40
Mercer	31200	74.01
Miami	82794	76.73
Monroe	10727	79.38
Montgomery	416587	77.70
Morgan	10998	78.81
Morrow	27052	77.53
Muskingum	66648	77.19
Noble	11503	81.20
Ottawa	32975	81.46
Paulding	14346	76.07
Perry	27133	76.56
Pickaway	45870	78.47
Pike	20802	76.28
Portage	131636	81.31
Preble	31806	77.53
Putnam	25541	74.26
Richland	97214	78.08
Ross	60718	78.65
Sandusky	45864	77.72
Scioto	58110	78.11
Seneca	43019	77.98
Shelby	36222	74.98
Stark	293541	78.34
Summit	426603	78.92
Trumbull	160351	79.30
Tuscarawas	71482	76.84
Union	46466	75.22
Van Wert	22018	76.43
Vinton	9997	77.78
Warren	180707	75.43
Washington	47993	80.07
Wayne	88289	75.55
Williams	28599	77.24
Wood	104934	79.54
Wyandot	16920	77.14