Illinois Citizen Population By County in 2012 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2012, the citizen population for Illinois was 11,857,625 and represented 92.47% of the total Illinois population.

Among all Illinois counties, Cook had the highest citizen population (4.60M), followed by DuPage (839.87K), and Will (637.47K).

In terms of percentages, Gallatin had the highest percentage of its population being citizens (100.00%), followed by Hardin (100.00%), and Massac (99.87%).

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 2012

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

See this for other years:

Illinois Citizen Population By County in 2012

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County	Citizen Population	% of County Population
Cook	4598635	88.48
DuPage	839865	91.43
Will	637465	94.07
Lake	631335	90.03
Kane	454030	88.18
McHenry	292530	94.93
Winnebago	281690	95.67
Madison	265735	98.94
St. Clair	265485	98.74
Sangamon	194390	98.44
Champaign	184335	91.74
Peoria	181310	97.27
McLean	162720	95.89
Rock Island	140470	95.23
Tazewell	134470	99.46
LaSalle	111245	97.85
Kendall	109870	96.19
Kankakee	109795	97.02
Macon	109290	98.85
DeKalb	100100	95.50
Vermilion	80730	99.10
Adams	66685	99.38
Williamson	65650	98.97
Jackson	57625	96.06
Whiteside	57445	98.37
Coles	53235	99.16
Ogle	51980	97.38
Knox	51865	98.42
Boone	50635	93.53
Henry	49730	98.71
Grundy	48910	98.08
Macoupin	47440	99.43
Stephenson	46950	98.78
Franklin	39350	99.57
Marion	39155	99.58
Livingston	38595	99.20
Woodford	38515	99.43
Jefferson	38470	98.87
Clinton	37595	99.47
Fulton	36435	98.50
Lee	35280	98.60
Morgan	35240	99.14
Christian	34635	99.51
Effingham	34105	99.55
Bureau	34010	97.73
Randolph	33050	99.09
Monroe	32905	99.70
McDonough	31895	97.93
Logan	29865	98.63
Montgomery	29755	99.27
Iroquois	29090	97.98
Saline	24905	99.72
Jersey	22780	99.30
Shelby	22265	99.78
Jo Daviess	22225	98.06
Perry	22130	99.30
Fayette	21925	99.30
Crawford	19665	99.44
Douglas	19275	96.81
Hancock	18990	99.61
Edgar	18460	99.70
Bond	17625	99.24
Union	17540	98.54
Warren	17140	96.70
Wayne	16670	99.67
Piatt	16560	99.28
De Witt	16510	99.70
Lawrence	16410	97.80
Mercer	16385	99.79
Pike	16375	99.64
Clark	16245	99.33
Richland	16040	99.14
Massac	15350	99.87
Carroll	15165	98.86
Moultrie	14780	99.56
Washington	14645	99.69
White	14605	99.46
Mason	14560	99.49
Ford	13965	99.43
Greene	13795	99.75
Clay	13740	99.35
Menard	12700	99.76
Johnson	12470	98.54
Cass	12425	91.56
Marshall	12400	98.69
Wabash	11810	98.95
Cumberland	10955	99.19
Jasper	9625	99.18
Hamilton	8415	99.82
Alexander	8080	99.20
Schuyler	7350	98.00
Henderson	7210	99.11
Brown	6745	97.54
Edwards	6670	99.70
Pulaski	6000	98.28
Stark	5975	99.83
Putnam	5885	98.58
Gallatin	5590	100.00
Scott	5310	99.81
Calhoun	5010	98.91
Pope	4385	99.66
Hardin	4315	100.00