Illinois Citizen Population By County in 2011 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2011, the citizen population for Illinois was 11,821,080 and represented 92.42% of the total Illinois population.

Among all Illinois counties, Cook had the highest citizen population (4.58M), followed by DuPage (834.18K), and Will (634.48K).

In terms of percentages, Hardin had the highest percentage of its population being citizens (99.89%), followed by Gallatin (99.82%), and Hamilton (99.82%).

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 2011

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

See this for other years:

Illinois Citizen Population By County in 2011

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County	Citizen Population	% of County Population
Cook	4584105	88.45
DuPage	834175	91.24
Will	634480	94.11
Lake	629795	89.92
Kane	448390	87.99
McHenry	291190	94.63
Winnebago	281880	95.59
Madison	265535	98.91
St. Clair	264630	98.71
Sangamon	193175	98.36
Champaign	182545	91.53
Peoria	180990	97.42
McLean	161385	95.93
Rock Island	140800	95.38
Tazewell	134000	99.53
LaSalle	111560	97.98
Kankakee	109690	97.16
Macon	109635	99.03
Kendall	106435	96.09
DeKalb	99775	95.31
Vermilion	81025	99.05
Adams	66665	99.43
Williamson	65405	99.06
Jackson	57725	96.37
Whiteside	57575	98.22
Coles	53120	98.95
Knox	52145	98.61
Ogle	51940	97.04
Boone	50605	93.57
Henry	49895	98.87
Grundy	48445	97.95
Macoupin	47630	99.48
Stephenson	47105	98.69
Marion	39425	99.60
Franklin	39320	99.44
Jefferson	38810	99.44
Livingston	38655	99.14
Woodford	38105	98.91
Clinton	37365	99.44
Fulton	36430	98.14
Lee	35610	98.89
Morgan	35415	99.27
Christian	34580	99.10
Bureau	34125	97.60
Effingham	34060	99.50
Randolph	33185	99.05
Monroe	32660	99.68
McDonough	32040	98.06
Logan	30025	98.91
Montgomery	29895	99.24
Iroquois	29320	98.06
Saline	25015	99.78
Jersey	22800	99.26
Jo Daviess	22295	98.17
Shelby	22260	99.69
Perry	22245	99.29
Fayette	21885	99.25
Crawford	19755	99.52
Douglas	19280	96.59
Hancock	19045	99.43
Edgar	18580	99.57
Bond	17680	99.05
Union	17605	98.43
Warren	17195	96.93
Wayne	16750	99.61
Lawrence	16595	98.46
Piatt	16595	99.31
De Witt	16540	99.43
Pike	16485	99.70
Mercer	16460	99.79
Clark	16340	99.39
Richland	15960	98.64
Massac	15400	99.74
Carroll	15345	99.16
Washington	14695	99.66
Mason	14670	99.19
Moultrie	14660	99.22
White	14650	99.36
Ford	14025	99.54
Greene	13855	99.61
Clay	13755	99.24
Menard	12700	99.76
Marshall	12545	98.86
Johnson	12460	98.38
Cass	12390	90.84
Wabash	11960	99.34
Cumberland	11005	99.37
Jasper	9650	99.13
Hamilton	8425	99.82
Alexander	8230	98.98
Schuyler	7365	97.94
Henderson	7280	98.65
Brown	6740	97.75
Edwards	6680	99.78
Pulaski	6065	98.06
Stark	5960	99.67
Putnam	5925	98.92
Gallatin	5675	99.82
Scott	5340	99.81
Calhoun	5020	98.53
Pope	4400	99.55
Hardin	4350	99.89