Illinois Citizen Population By County in 2017 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2017, the citizen population for Illinois was 11,940,645 and represented 92.89% of the total Illinois population.

Among all Illinois counties, Cook had the highest citizen population (4.68M), followed by DuPage (857.50K), and Will (650.00K).

In terms of percentages, Gallatin had the highest percentage of its population being citizens (100.00%), followed by Hardin (100.00%), and Greene (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:
Illinois Citizen Voting-age Population By County in 2017

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

See this for other years:

Illinois Citizen Population By County in 2017

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County	Citizen Population	% of County Population
Cook	4677645	89.29
DuPage	857495	92.02
Will	649995	94.51
Lake	638760	90.67
Kane	471595	89.08
McHenry	294795	95.70
Winnebago	275305	95.76
Madison	263220	98.90
St. Clair	260980	98.69
Sangamon	194855	98.35
Champaign	190895	91.80
Peoria	179825	96.61
McLean	165430	95.50
Rock Island	138930	95.02
Tazewell	133490	99.11
Kendall	118020	96.00
LaSalle	109105	98.16
Kankakee	107200	96.75
Macon	106305	98.81
DeKalb	99825	95.55
Vermilion	78040	98.53
Williamson	66925	99.19
Adams	66360	99.36
Jackson	56785	96.06
Whiteside	55985	98.52
Coles	51700	98.40
Boone	50575	94.29
Knox	50325	97.96
Ogle	50145	97.14
Grundy	49825	98.99
Henry	49080	98.85
Macoupin	45885	99.84
Stephenson	45410	99.06
Franklin	39140	99.59
Woodford	38805	99.65
Jefferson	38130	99.40
Marion	38030	99.28
Clinton	37320	99.15
Livingston	36330	98.70
Fulton	35225	98.57
Lee	34130	98.44
Morgan	34085	98.97
Effingham	33905	99.24
Monroe	33555	99.45
Christian	33330	99.32
Bureau	32880	97.80
Randolph	32620	99.36
McDonough	30775	97.41
Logan	29245	99.17
Montgomery	29100	99.74
Iroquois	27970	98.30
Saline	24325	99.57
Jersey	22030	99.17
Fayette	21900	99.64
Shelby	21865	99.82
Jo Daviess	21735	98.59
Perry	21325	99.35
Douglas	19430	97.98
Crawford	19050	99.14
Hancock	18175	99.51
Edgar	17500	99.40
Union	16965	98.26
Bond	16790	98.56
Warren	16685	95.73
Wayne	16485	99.49
Piatt	16325	99.33
Lawrence	16220	98.57
De Witt	16045	99.20
Pike	15905	99.84
Clark	15805	99.25
Richland	15770	98.84
Mercer	15735	99.62
Moultrie	14625	99.42
Carroll	14610	99.35
Massac	14575	99.86
Washington	14225	99.76
White	14060	99.12
Mason	13875	99.78
Ford	13380	99.33
Clay	13320	99.44
Greene	13295	99.89
Johnson	12800	99.23
Menard	12390	99.80
Marshall	11850	99.37
Cass	11795	91.58
Wabash	11360	98.19
Cumberland	10865	99.68
Jasper	9465	98.49
Hamilton	8240	99.76
Schuyler	7140	99.44
Henderson	6880	99.35
Alexander	6740	99.48
Brown	6680	98.38
Edwards	6550	99.70
Putnam	5690	98.61
Pulaski	5655	99.39
Stark	5515	99.37
Gallatin	5225	100.00
Scott	5090	99.61
Calhoun	4880	99.69
Pope	4350	99.77
Hardin	4160	100.00