Illinois Citizen Population By County in 2024 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2024, the citizen population for Illinois was 11,802,475 and represented 92.97% of the total Illinois population.

Among all Illinois counties, Cook had the highest citizen population (4.65M), followed by DuPage (850.41K), and Will (660.32K).

In terms of percentages, Hardin had the highest percentage of its population being citizens (100.03%), followed by Greene (99.97%), and Gallatin (99.96%).

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 2024

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

See this for other years:

Illinois Citizen Population By County in 2024

Items per page:

0 of 0

County	Citizen Population	% of County Population
Cook	4646987	89.67
DuPage	850408	91.44
Will	660317	94.13
Lake	645830	90.42
Kane	470869	91.03
McHenry	298287	95.42
Winnebago	270316	95.42
Madison	261757	99.06
St. Clair	249852	98.49
Sangamon	191455	98.21
Champaign	188698	90.40
Peoria	172182	95.85
McLean	163709	95.43
Rock Island	136161	95.38
Kendall	130105	94.50
Tazewell	129441	99.35
LaSalle	106556	98.02
Kankakee	103577	97.13
Macon	100375	98.55
DeKalb	97146	96.47
Vermilion	72037	99.53
Williamson	66245	99.06
Adams	64447	99.52
Whiteside	54179	98.60
Grundy	52638	98.91
Jackson	51045	96.20
Boone	50317	94.52
Ogle	50315	97.71
Henry	48335	99.37
Knox	48000	97.87
Coles	46192	98.75
Macoupin	44162	99.58
Stephenson	43149	98.59
Woodford	37975	99.12
Franklin	37082	99.36
Marion	36730	99.27
Clinton	36444	98.63
Jefferson	36242	99.16
Livingston	35197	98.96
Monroe	34888	99.58
Effingham	34211	99.10
Lee	33393	98.59
Christian	33376	99.51
Morgan	32894	99.61
Fulton	32789	99.30
Bureau	32373	98.50
Randolph	29429	97.91
Montgomery	27875	99.75
Logan	27503	99.24
McDonough	26457	98.27
Iroquois	25935	98.06
Saline	23100	99.51
Jo Daviess	21667	99.18
Fayette	21229	99.58
Jersey	21128	99.31
Shelby	20650	99.66
Perry	20511	99.39
Douglas	19277	97.60
Crawford	18454	99.69
Hancock	17103	98.96
Union	16751	98.56
Bond	16615	99.39
Piatt	16582	99.32
Edgar	16451	99.49
Warren	15702	95.49
Wayne	15688	98.22
Richland	15444	99.02
Mercer	15441	99.66
Carroll	15344	98.50
De Witt	15278	99.39
Clark	15141	99.18
Lawrence	14870	98.93
Pike	14377	99.35
Moultrie	14373	99.67
Massac	13738	99.07
Washington	13588	99.72
White	13570	99.66
Johnson	13286	99.34
Ford	13155	98.13
Clay	13036	99.87
Mason	12722	99.81
Menard	12050	99.64
Greene	11681	99.97
Marshall	11579	99.41
Cass	11371	88.95
Wabash	11024	99.17
Cumberland	10325	99.90
Jasper	9087	99.01
Hamilton	7899	99.79
Schuyler	6777	99.87
Brown	6260	99.05
Henderson	6183	99.82
Edwards	6047	99.51
Putnam	5590	99.82
Stark	5228	98.47
Pulaski	5006	99.86
Scott	4916	99.55
Alexander	4858	99.61
Gallatin	4813	99.96
Calhoun	4328	99.91
Pope	3725	99.57
Hardin	3605	100.03