Ohio Citizen Population By County in 2015 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2015, the citizen population for Ohio was 11,338,945 and represented 97.95% of the total Ohio population.

Among all Ohio counties, Cuyahoga had the highest citizen population (1.23M), followed by Franklin (1.15M), and Hamilton (781.54K).

In terms of percentages, Monroe had the highest percentage of its population being citizens (99.93%), followed by Lawrence (99.90%), and Vinton (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 2015

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

See this for other years:

Ohio Citizen Population By County in 2015

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County	Citizen Population	% of County Population
Cuyahoga	1227835	97.20
Franklin	1145845	94.25
Hamilton	781540	97.18
Summit	530120	97.84
Montgomery	522410	97.87
Lucas	429555	98.46
Stark	371780	99.15
Butler	361890	97.14
Lorain	299950	98.94
Mahoning	231135	98.54
Lake	224070	97.66
Warren	213335	97.01
Trumbull	205415	99.54
Clermont	198485	99.10
Delaware	181070	97.65
Medina	173520	99.25
Licking	167330	99.19
Greene	160000	97.45
Portage	157965	97.57
Fairfield	147345	98.82
Clark	135255	98.85
Wood	126550	98.19
Richland	121570	99.40
Wayne	114150	98.94
Columbiana	105425	99.47
Allen	104610	99.44
Miami	102720	99.23
Ashtabula	99115	99.34
Geauga	93145	99.22
Tuscarawas	91855	99.09
Muskingum	85570	99.48
Scioto	77525	99.37
Ross	76990	99.55
Erie	75625	99.32
Hancock	74255	98.44
Belmont	69240	99.54
Jefferson	67785	99.60
Marion	65440	99.23
Athens	62700	96.50
Lawrence	61760	99.90
Washington	60940	99.33
Knox	60595	99.33
Sandusky	59820	99.39
Huron	57825	98.12
Pickaway	56390	99.78
Seneca	55500	99.23
Union	52780	98.71
Ashland	52660	99.00
Darke	52160	99.63
Shelby	48625	99.10
Auglaize	45600	99.40
Logan	45260	99.51
Brown	44090	99.65
Holmes	43290	99.67
Madison	43030	99.02
Highland	42955	99.50
Crawford	42495	99.46
Fulton	42175	99.27
Clinton	41715	99.58
Preble	41445	99.44
Ottawa	41050	99.73
Mercer	40660	99.50
Guernsey	39530	99.76
Champaign	39230	99.58
Defiance	38430	99.38
Williams	37170	99.43
Coshocton	36675	99.86
Perry	35965	99.83
Morrow	34925	99.80
Putnam	33985	99.42
Jackson	32650	99.38
Hardin	31460	99.13
Gallia	30395	99.44
Hocking	28710	99.29
Van Wert	28515	99.79
Fayette	28440	98.85
Pike	28320	99.74
Carroll	28210	99.47
Adams	28155	99.73
Henry	27815	99.29
Meigs	23415	99.74
Wyandot	22325	99.38
Paulding	18980	99.04
Harrison	15610	99.84
Morgan	14865	99.67
Monroe	14535	99.93
Noble	14465	99.69
Vinton	13220	99.89