Illinois Population by County

Data Item State
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Population, 2014 estimate - (Number)
County Value
Adams 66,988
Alexander 7,492
Bond 17,269
Boone 53,869
Brown 6,832
Bureau 33,840
Calhoun 4,956
Carroll 14,715
Cass 13,156
Champaign 207,133
Christian 33,892
Clark 16,180
Clay 13,520
Clinton 37,857
Coles 53,320
Cook 5,246,456
Crawford 19,393
Cumberland 10,833
De Witt 16,284
DeKalb 105,462
Douglas 19,889
DuPage 932,708
Edgar 17,841
Edwards 6,617
Effingham 34,320
Fayette 21,870
Ford 13,688
Franklin 39,411
Fulton 36,007
Gallatin 5,291
Greene 13,434
Grundy 50,425
Hamilton 8,296
Hancock 18,564
Hardin 4,129
Henderson 6,916
Henry 49,635
Iroquois 28,879
Jackson 59,677
Jasper 9,623
Jefferson 38,534
Jersey 22,571
Jo Daviess 22,254
Johnson 12,601
Kane 527,306
Kankakee 111,375
Kendall 121,350
Knox 52,069
Lake 705,186
LaSalle 111,241
Lawrence 16,519
Lee 34,735
Livingston 37,903
Logan 29,746
Macon 108,350
Macoupin 46,453
Madison 266,560
Marion 38,571
Marshall 12,014
Mason 13,898
Massac 14,905
McDonough 31,880
McHenry 307,283
McLean 174,061
Menard 12,570
Mercer 15,945
Monroe 33,722
Montgomery 29,359
Morgan 34,929
Moultrie 14,837
Ogle 52,085
Peoria 187,319
Perry 21,672
Piatt 16,431
Pike 16,022
Pope 4,276
Pulaski 5,815
Putnam 5,814
Randolph 32,869
Richland 16,061
Rock Island 146,063
Saline 24,612
Sangamon 198,997
Schuyler 7,330
Scott 5,204
Shelby 22,048
St. Clair 265,729
Stark 5,813
Stephenson 46,435
Tazewell 135,707
Union 17,447
Vermilion 79,728
Wabash 11,549
Warren 17,874
Washington 14,337
Wayne 16,543
White 14,374
Whiteside 56,876
Will 685,419
Williamson 67,008
Winnebago 288,542
Woodford 39,187

Value for Illinois (Number): 12,880,580

Data item: Population, 2014 estimate

Source: U.S. Bureau of the Census, Population Estimates Program (PEP). Updated annually. http://www.census.gov/popest/index.html. Census Bureau, 2010 Census of Population, Public Law 94-171 Redistricting Data File. Updated every 10 years. http://factfinder2.census.gov.

Definition: Estimates are made for the United States, states, counties, places, and metropolitan areas within the United States. The timing of estimates and availability of demographic detail vary by geographic level. Therefore, estimates for a specific year may be inconsistent across multiple geographies, or within a geography (e.g., states) where new totals may have been issues before estimates by demographic characteristics have been updated. The schedule of releases is available at http://www.census.gov/popest/schedule.html.

All persons who are "usually resident" in a specified geographic area. The U.S. resident population includes all persons who usually reside in the 50 states and the District of Columbia, but excludes residents of the Commonwealth of Puerto Rico and the Island areas under U.S. sovereignty or jurisdiction (principally American Samoa, Guam, United States Virgin Islands, and the Commonwealth of the Northern Mariana Islands). In addition, the U.S. resident population excludes U.S. Armed Forces overseas and civilian U.S. citizens whose usual place of residence is outside the United States.

Estimates Base - The population count or estimate used as the starting point in the estimates process. It can be the most recent updated Census count or the estimate for a previous date within the same vintage. (The vintage year (e.g., 2014) refers to the final year of the time series).

Population percent change, 2010 to 2014, is derived by dividing the difference between the 2013 population estimate and the April 1, 2010 estimates base by the April 1, 2010 estimates base.

Scope and Methodology