Illinois Citizen Population By County in 2010 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2010, the citizen population for Illinois was 11,777,750 and represented 92.41% of the total Illinois population.

Among all Illinois counties, Cook had the highest citizen population (4.57M), followed by DuPage (830.61K), and Will (627.43K).

In terms of percentages, Scott had the highest percentage of its population being citizens (99.91%), followed by Menard (99.88%), and Edwards (99.85%).

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 2010

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

See this for other years:

Illinois Citizen Population By County in 2010

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County	Citizen Population	% of County Population
Cook	4571630	88.38
DuPage	830610	91.13
Will	627435	93.93
Lake	626440	89.85
Kane	441905	87.92
McHenry	289395	94.56
Winnebago	281245	95.67
Madison	265315	99.00
St. Clair	263655	98.85
Sangamon	192475	98.56
Champaign	181995	91.98
Peoria	180705	97.62
McLean	160470	96.26
Rock Island	141415	95.86
Tazewell	133080	99.41
LaSalle	111395	97.90
Macon	109555	98.95
Kankakee	108835	97.09
Kendall	101065	95.71
DeKalb	99485	95.64
Vermilion	81005	98.74
Adams	66705	99.52
Williamson	65055	99.20
Jackson	57950	96.80
Whiteside	57765	98.32
Coles	53125	99.17
Knox	52205	98.63
Ogle	51935	96.93
Boone	50090	93.51
Henry	49955	98.97
Macoupin	47820	99.67
Grundy	47715	97.89
Stephenson	47210	98.79
Marion	39555	99.59
Franklin	39430	99.75
Jefferson	39010	99.52
Livingston	38660	99.10
Woodford	37925	99.22
Clinton	37125	99.28
Fulton	36545	98.23
Lee	35665	98.80
Morgan	35580	99.51
Christian	34565	98.94
Bureau	34315	97.81
Effingham	34020	99.39
Randolph	33295	99.20
Monroe	32285	99.55
McDonough	32170	98.29
Logan	30205	99.23
Montgomery	29995	99.22
Iroquois	29565	98.32
Saline	25100	99.72
Jersey	22785	99.37
Shelby	22275	99.62
Perry	22265	99.00
Jo Daviess	22215	97.73
Fayette	21850	99.30
Crawford	19740	99.37
Douglas	19350	96.70
Hancock	19130	99.51
Edgar	18730	99.76
Bond	17805	99.44
Union	17705	98.58
Warren	17240	97.15
Wayne	16790	99.67
Lawrence	16650	98.81
Piatt	16585	99.25
Pike	16550	99.82
De Witt	16545	99.25
Mercer	16500	99.70
Clark	16475	99.58
Richland	16035	99.20
Carroll	15515	99.36
Massac	15390	99.77
Mason	14810	99.26
Washington	14800	99.73
White	14705	99.36
Moultrie	14670	99.63
Ford	14005	99.22
Greene	13925	99.57
Clay	13815	99.21
Menard	12685	99.88
Cass	12660	92.75
Marshall	12615	98.83
Johnson	12520	98.51
Wabash	12085	99.55
Cumberland	11045	99.73
Jasper	9705	99.54
Hamilton	8440	99.82
Alexander	8355	98.88
Schuyler	7370	97.94
Henderson	7360	98.66
Brown	6735	97.68
Edwards	6695	99.85
Stark	6055	99.51
Pulaski	6015	96.09
Putnam	5915	98.91
Gallatin	5765	99.83
Scott	5370	99.91
Calhoun	5050	98.63
Pope	4415	99.77
Hardin	4385	99.66