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

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2021, the citizen population for Ohio was 11,508,445 and represented 97.78% of the total Ohio population.

Among all Ohio counties, Franklin had the highest citizen population (1.24M), followed by Cuyahoga (1.23M), and Hamilton (800.29K).

In terms of percentages, Hocking had the highest percentage of its population being citizens (99.97%), followed by Holmes (99.94%), and Morgan (99.89%).

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 2021

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

See this for other years:

Ohio Citizen Population By County in 2021

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County	Citizen Population	% of County Population
Franklin	1236210	94.11
Cuyahoga	1227330	97.13
Hamilton	800290	96.80
Summit	528065	97.69
Montgomery	522830	97.52
Lucas	424690	98.49
Butler	374080	96.46
Stark	371315	99.09
Lorain	308340	98.91
Warren	230020	96.02
Mahoning	227070	99.14
Lake	226970	97.75
Clermont	205315	98.88
Delaware	202535	95.93
Trumbull	201615	99.71
Medina	179585	98.97
Licking	175845	99.09
Greene	163835	98.08
Portage	159255	98.37
Fairfield	154945	98.30
Clark	134740	99.05
Wood	129675	98.29
Richland	123790	99.43
Wayne	115350	98.71
Miami	106590	98.79
Columbiana	102110	99.79
Allen	101695	99.25
Ashtabula	97325	99.44
Geauga	94730	99.29
Tuscarawas	92190	99.10
Muskingum	86190	99.82
Ross	76835	99.52
Erie	75035	99.31
Scioto	74120	99.64
Hancock	73535	97.86
Belmont	66915	99.76
Jefferson	65385	99.64
Marion	65090	99.35
Knox	61930	99.25
Athens	60925	96.81
Union	60285	97.60
Washington	59530	99.32
Sandusky	58585	99.27
Lawrence	58320	99.57
Pickaway	58265	99.67
Huron	58175	99.30
Seneca	54770	99.28
Ashland	52220	99.16
Darke	51725	99.78
Shelby	47975	99.32
Auglaize	46045	99.49
Logan	45735	99.44
Holmes	44140	99.94
Brown	43590	99.76
Madison	43390	98.74
Highland	42995	99.62
Fulton	42375	99.22
Mercer	41635	98.77
Crawford	41505	98.96
Clinton	41380	98.42
Preble	40880	99.65
Ottawa	40335	99.64
Champaign	38560	99.69
Guernsey	38415	99.68
Defiance	37945	99.00
Williams	36690	99.10
Coshocton	36535	99.77
Perry	35370	99.80
Morrow	34785	99.70
Putnam	34200	99.43
Jackson	32405	99.62
Hardin	30225	98.33
Gallia	29250	99.59
Van Wert	28710	99.65
Fayette	28520	98.70
Hocking	28170	99.97
Adams	27460	99.62
Henry	27430	99.31
Pike	27140	99.52
Carroll	26830	99.87
Meigs	22310	99.78
Wyandot	21745	99.13
Paulding	18735	99.34
Harrison	14570	99.62
Noble	14115	99.65
Morgan	13940	99.89
Monroe	13450	99.52
Vinton	12795	99.53