Ohio Citizen Population By County in 2020 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2020, the citizen population for Ohio was 11,419,960 and represented 97.81% of the total Ohio population.

Among all Ohio counties, Franklin had the highest citizen population (1.23M), followed by Cuyahoga (1.21M), and Hamilton (790.48K).

In terms of percentages, Morgan had the highest percentage of its population being citizens (100.00%), followed by Carroll (99.93%), and Monroe (99.93%).

The chart and table below shows the citizen population of each county and the percentage of each county's population that were citizens.

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

You may also be interested in:
Ohio Citizen Voting-age Population By County in 2020

Data Source: US Census - ACS 5-Year (CVAP).

See this for other years:

Ohio Citizen Population By County in 2020

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County	Citizen Population	% of County Population
Franklin	1230065	94.28
Cuyahoga	1205850	97.13
Hamilton	790475	96.90
Summit	526980	97.44
Montgomery	519170	97.59
Lucas	423350	98.38
Butler	369595	96.72
Stark	368560	99.21
Lorain	305690	98.89
Mahoning	226455	99.13
Lake	224710	97.80
Warren	224565	96.57
Clermont	203475	98.96
Trumbull	198550	99.70
Delaware	197100	95.93
Medina	177465	99.08
Licking	173825	99.10
Greene	164400	97.94
Portage	159110	97.93
Fairfield	153805	98.46
Clark	133130	99.05
Wood	128490	98.34
Richland	120075	99.20
Wayne	114695	98.82
Miami	105015	99.00
Columbiana	102020	99.52
Allen	101995	99.21
Ashtabula	96935	99.51
Geauga	92945	99.24
Tuscarawas	91180	98.93
Muskingum	85735	99.65
Ross	76420	99.49
Scioto	75170	99.64
Hancock	73895	97.53
Erie	73795	99.16
Belmont	67230	99.71
Jefferson	65670	99.58
Marion	64750	99.34
Athens	64060	97.14
Knox	61380	99.36
Washington	59710	99.16
Lawrence	59705	99.67
Sandusky	58325	99.19
Pickaway	57910	99.66
Huron	57775	99.15
Union	56805	98.16
Seneca	54590	98.81
Ashland	53025	99.05
Darke	51080	99.41
Shelby	48285	99.33
Auglaize	45520	99.58
Logan	45025	99.36
Holmes	43920	99.92
Madison	43785	98.95
Brown	43405	99.76
Highland	42930	99.65
Fulton	41925	99.38
Clinton	41465	98.73
Crawford	41175	98.97
Preble	40825	99.59
Mercer	40520	98.75
Ottawa	40425	99.68
Guernsey	38855	99.64
Champaign	38745	99.70
Defiance	37620	98.94
Coshocton	36465	99.74
Williams	36440	99.13
Perry	36025	99.86
Morrow	35050	99.72
Putnam	33665	99.50
Jackson	32390	99.85
Hardin	30890	98.39
Gallia	29810	99.38
Hocking	28245	99.79
Fayette	28220	98.64
Van Wert	28115	99.65
Pike	27865	99.82
Adams	27545	99.49
Carroll	27175	99.93
Henry	26870	99.26
Meigs	22920	99.76
Wyandot	21735	99.22
Paulding	18635	99.44
Harrison	15050	99.47
Morgan	14555	100.00
Noble	14350	99.58
Monroe	13815	99.93
Vinton	13015	99.77