Ohio Citizen Population By County in 2018 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2018, the citizen population for Ohio was 11,388,260 and represented 97.82% of the total Ohio population.

Among all Ohio counties, Cuyahoga had the highest citizen population (1.22M), followed by Franklin (1.20M), and Hamilton (787.38K).

In terms of percentages, Meigs had the highest percentage of its population being citizens (99.96%), followed by Carroll (99.95%), and Morrow (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 2018

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

See this for other years:

Ohio Citizen Population By County in 2018

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County	Citizen Population	% of County Population
Cuyahoga	1217665	97.12
Franklin	1200585	94.14
Hamilton	787375	96.96
Summit	528340	97.51
Montgomery	519465	97.64
Lucas	424885	98.27
Stark	370160	99.11
Butler	367055	97.03
Lorain	303265	98.88
Mahoning	228980	99.10
Lake	224920	97.77
Warren	219360	96.82
Trumbull	201100	99.66
Clermont	201055	98.94
Delaware	190715	96.81
Medina	175885	99.23
Licking	170590	99.01
Greene	161775	97.57
Portage	158250	97.30
Fairfield	150930	98.71
Clark	133455	98.71
Wood	127665	98.25
Richland	120595	99.40
Wayne	114965	98.93
Miami	103785	99.03
Columbiana	103460	99.48
Allen	102960	99.34
Ashtabula	97485	99.34
Geauga	93335	99.34
Tuscarawas	91475	98.87
Muskingum	85575	99.42
Ross	76700	99.55
Scioto	76030	99.55
Erie	74435	99.07
Hancock	74135	97.95
Belmont	68120	99.49
Jefferson	66635	99.63
Marion	64810	99.18
Athens	63640	96.52
Knox	60855	99.41
Lawrence	60350	99.56
Washington	60245	99.30
Sandusky	58955	99.42
Huron	57640	98.61
Pickaway	57185	99.59
Seneca	54865	98.90
Union	54475	97.88
Ashland	52820	98.78
Darke	51495	99.54
Shelby	48310	99.01
Auglaize	45590	99.57
Logan	45030	99.39
Holmes	43785	99.83
Brown	43520	99.63
Madison	43465	98.81
Highland	42805	99.54
Fulton	41950	99.16
Crawford	41725	99.30
Clinton	41590	99.27
Preble	41000	99.50
Ottawa	40600	99.73
Mercer	40405	99.02
Guernsey	39125	99.62
Champaign	38725	99.64
Defiance	37970	99.19
Williams	36800	99.63
Coshocton	36520	99.85
Perry	35935	99.86
Morrow	34950	99.93
Putnam	33745	99.34
Jackson	32325	99.39
Hardin	31170	98.83
Gallia	30035	99.47
Hocking	28400	99.67
Fayette	28250	98.62
Van Wert	28200	99.72
Pike	28185	99.89
Adams	27790	99.68
Carroll	27565	99.95
Henry	27120	99.29
Meigs	23150	99.96
Wyandot	21845	98.82
Paulding	18715	99.18
Harrison	15250	99.64
Morgan	14670	99.80
Noble	14370	99.48
Monroe	14075	99.89
Vinton	13080	99.77