Illinois Citizen Population By County in 2019 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2019, the citizen population for Illinois was 11,884,945 and represented 93.07% of the total Illinois population.

Among all Illinois counties, Cook had the highest citizen population (4.66M), followed by DuPage (855.83K), and Will (651.57K).

In terms of percentages, Clay had the highest percentage of its population being citizens (99.93%), followed by Mason (99.93%), and Alexander (99.92%).

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 2019

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

See this for other years:

Illinois Citizen Population By County in 2019

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County	Citizen Population	% of County Population
Cook	4656260	89.57
DuPage	855825	92.12
Will	651565	94.52
Lake	636140	90.69
Kane	480025	90.34
McHenry	294970	95.86
Winnebago	272640	95.72
Madison	261900	98.91
St. Clair	258055	98.37
Sangamon	193660	98.37
Champaign	192520	91.71
Peoria	177335	97.03
McLean	165565	95.94
Rock Island	136925	95.17
Tazewell	131880	99.01
Kendall	120550	95.63
LaSalle	107615	98.07
Kankakee	107525	97.19
Macon	104595	99.11
DeKalb	100125	95.94
Vermilion	76555	98.70
Williamson	66510	99.12
Adams	65810	99.58
Jackson	55595	95.90
Whiteside	54970	98.13
Coles	50635	98.60
Boone	50150	93.68
Grundy	49820	98.33
Ogle	49680	97.36
Knox	49160	97.33
Henry	48700	98.85
Macoupin	45320	99.68
Stephenson	44640	98.99
Franklin	38800	99.68
Woodford	38610	99.77
Jefferson	37670	99.17
Marion	37510	99.38
Clinton	37250	98.98
Livingston	35510	98.53
Fulton	34775	99.10
Lee	33970	98.78
Monroe	33965	99.40
Morgan	33875	98.92
Effingham	33650	98.58
Christian	32660	99.18
Bureau	32410	97.86
Randolph	31980	99.03
McDonough	29810	97.80
Logan	28745	99.10
Montgomery	28710	99.58
Iroquois	27285	98.11
Saline	23925	99.71
Jersey	21800	99.39
Shelby	21670	99.70
Fayette	21450	99.47
Jo Daviess	21305	98.68
Perry	21125	99.41
Douglas	19250	98.09
Crawford	18805	99.13
Hancock	17910	99.58
Edgar	17370	99.80
Union	16715	98.50
Warren	16480	96.12
Bond	16385	98.76
Wayne	16315	99.48
Piatt	16285	99.30
Lawrence	15805	98.57
De Witt	15765	98.96
Pike	15620	99.68
Richland	15590	98.89
Clark	15570	99.08
Mercer	15560	99.81
Moultrie	14550	99.39
Carroll	14370	99.34
Massac	14125	99.33
Washington	14015	99.68
White	13735	99.03
Mason	13610	99.93
Clay	13275	99.93
Ford	13225	99.66
Greene	13090	99.70
Johnson	12345	98.80
Menard	12280	99.80
Marshall	11600	99.32
Cass	11460	91.72
Wabash	11385	98.61
Cumberland	10775	99.45
Jasper	9510	99.11
Hamilton	8160	99.82
Henderson	6765	99.34
Schuyler	6750	97.05
Brown	6540	98.64
Edwards	6440	99.77
Alexander	6255	99.92
Putnam	5685	99.39
Pulaski	5475	99.37
Stark	5415	99.45
Gallatin	5060	99.90
Scott	4985	99.60
Calhoun	4820	99.79
Pope	4180	99.41
Hardin	3935	99.87