Illinois Citizen Population By County in 2023 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2023, the citizen population for Illinois was 11,830,615 and represented 93.21% of the total Illinois population.

Among all Illinois counties, Cook had the highest citizen population (4.67M), followed by DuPage (849.93K), and Will (659.45K).

In terms of percentages, Alexander had the highest percentage of its population being citizens (100.00%), followed by Calhoun (100.00%), and Greene (100.00%).

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 2023

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

See this for other years:

Illinois Citizen Population By County in 2023

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County	Citizen Population	% of County Population
Cook	4665755	89.97
DuPage	849925	91.66
Will	659445	94.42
Lake	645140	90.62
Kane	471455	91.35
McHenry	298240	95.79
Winnebago	270480	95.48
Madison	262500	99.20
St. Clair	251245	98.61
Sangamon	192060	98.38
Champaign	187830	91.14
Peoria	172435	95.89
McLean	164100	96.03
Rock Island	136445	95.42
Tazewell	129720	99.36
Kendall	128185	94.91
LaSalle	106915	98.04
Kankakee	103890	97.24
Macon	101055	98.50
DeKalb	97260	96.77
Vermilion	72730	99.39
Williamson	66125	98.84
Adams	64865	99.54
Whiteside	54420	98.61
Grundy	52280	98.79
Jackson	50730	96.25
Boone	50670	95.04
Ogle	50195	97.40
Henry	48635	99.36
Knox	48135	97.65
Coles	46105	98.75
Macoupin	44415	99.66
Stephenson	43525	98.83
Woodford	38040	99.19
Franklin	37330	99.44
Marion	37030	99.29
Jefferson	36560	99.32
Clinton	36320	98.43
Livingston	35395	99.26
Monroe	34915	99.84
Effingham	34070	98.74
Lee	33590	98.62
Christian	33545	99.58
Fulton	33040	99.34
Morgan	32505	99.65
Bureau	32470	98.32
Randolph	29590	98.18
Montgomery	27960	99.57
Logan	27685	99.34
McDonough	26760	98.75
Iroquois	26220	98.04
Saline	23225	99.32
Jo Daviess	21810	99.50
Fayette	21270	99.49
Jersey	21165	99.20
Shelby	20780	99.59
Perry	20660	99.28
Douglas	19255	97.82
Crawford	18515	99.60
Hancock	17260	99.00
Union	16755	98.73
Piatt	16660	99.76
Edgar	16585	99.70
Bond	16470	99.07
Warren	16155	97.47
Wayne	15770	98.59
Richland	15580	99.39
Mercer	15575	99.71
Carroll	15550	99.55
De Witt	15350	99.29
Clark	15220	99.28
Lawrence	14985	99.01
Pike	14530	99.35
Moultrie	14435	99.76
Massac	13815	98.96
White	13665	99.67
Washington	13640	99.71
Johnson	13290	99.55
Ford	13190	98.47
Clay	13150	99.81
Mason	12865	99.88
Menard	12115	99.55
Greene	11835	100.00
Marshall	11605	99.06
Cass	11495	89.63
Wabash	11105	99.15
Cumberland	10360	99.81
Jasper	9185	99.46
Hamilton	7955	99.81
Schuyler	6775	99.27
Brown	6290	99.53
Henderson	6270	99.76
Edwards	6105	99.76
Putnam	5585	99.73
Stark	5265	98.87
Pulaski	5070	99.90
Alexander	5040	100.00
Gallatin	4845	99.79
Scott	4835	99.79
Calhoun	4405	100.00
Pope	3740	99.60
Hardin	3610	99.59