Illinois Citizen Population By County in 2016 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2016, the citizen population for Illinois was 11,928,170 and represented 92.81% of the total Illinois population.

Among all Illinois counties, Cook had the highest citizen population (4.66M), followed by DuPage (854.00K), and Will (647.91K).

In terms of percentages, Gallatin had the highest percentage of its population being citizens (100.00%), followed by Hardin (100.00%), and Hamilton (99.94%).

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 2016

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

See this for other years:

Illinois Citizen Population By County in 2016

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County	Citizen Population	% of County Population
Cook	4659955	89.14
DuPage	853995	91.78
Will	647905	94.53
Lake	636385	90.54
Kane	467065	88.69
McHenry	293160	95.47
Winnebago	277060	95.90
Madison	263690	98.85
St. Clair	262500	98.84
Sangamon	195650	98.50
Champaign	190500	92.29
Peoria	180990	96.88
McLean	165460	95.50
Rock Island	139250	95.03
Tazewell	134305	99.19
Kendall	116635	96.04
LaSalle	109965	98.24
Kankakee	107915	96.79
Macon	107055	98.76
DeKalb	100320	96.04
Vermilion	78525	98.63
Williamson	66675	99.02
Adams	66525	99.37
Jackson	56625	95.67
Whiteside	56470	98.80
Coles	52020	98.52
Knox	50815	98.19
Ogle	50410	96.88
Boone	50345	93.83
Grundy	49750	98.83
Henry	48910	98.45
Macoupin	46380	99.79
Stephenson	45845	99.05
Franklin	39320	99.53
Woodford	38995	99.67
Jefferson	38260	99.31
Marion	38215	99.25
Clinton	37615	99.35
Livingston	36860	98.87
Fulton	35480	98.43
Morgan	34395	98.84
Lee	34190	98.47
Effingham	34050	99.11
Christian	33810	99.76
Monroe	33595	99.67
Bureau	32970	97.49
Randolph	32740	99.41
McDonough	30870	97.31
Logan	29505	98.94
Montgomery	29180	99.59
Iroquois	28230	97.97
Saline	24520	99.43
Jersey	22305	99.40
Shelby	21945	99.71
Fayette	21910	99.48
Jo Daviess	21905	98.74
Perry	21475	99.44
Douglas	19335	97.80
Crawford	19235	98.95
Hancock	18555	99.57
Edgar	17740	99.50
Union	17165	98.31
Bond	16865	98.42
Warren	16720	94.95
Wayne	16450	99.61
Piatt	16350	99.27
Lawrence	16235	97.92
De Witt	16180	99.14
Pike	16015	99.75
Clark	15980	99.32
Richland	15970	99.38
Mercer	15930	99.75
Massac	14845	99.73
Moultrie	14835	99.46
Carroll	14590	98.61
White	14320	99.38
Washington	14310	99.58
Mason	13885	99.68
Ford	13680	99.42
Clay	13390	99.44
Greene	13365	99.81
Johnson	12775	99.30
Menard	12560	99.88
Cass	12040	92.12
Marshall	11980	99.34
Wabash	11370	98.14
Cumberland	10850	99.63
Jasper	9525	99.32
Hamilton	8245	99.94
Schuyler	7150	99.24
Alexander	7020	99.57
Henderson	6915	99.28
Brown	6740	98.61
Edwards	6600	99.85
Stark	5825	99.74
Pulaski	5745	99.22
Putnam	5655	98.43
Gallatin	5325	100.00
Scott	5155	99.71
Calhoun	4945	99.70
Pope	4250	99.88
Hardin	4175	100.00