Illinois
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Illinois Population News Articles
Population Density
Historic & Projected Growth
Population by County
POPULATION DENSITY
People per square mile, 2010: 231.1
People per square mile, 2020: 230.8
HISTORIC & PROJECTED GROWTH 1790 TO 2040
Year |
Population |
1790 |
0 |
1800 |
0 |
1810 |
12,282 |
1820 |
55,211 |
1830 |
157,445 |
1840 |
476,173 |
1850 |
851,470 |
1860 |
1,711,951 |
1870 |
2,539,891 |
1880 |
3,077,871 |
1890 |
3,826,352 |
1900 |
4,821,550 |
1910 |
5,638,591 |
1920 |
6,485,280 |
1930 |
7,630,654 |
1940 |
7,897,241 |
1950 |
8,712,176 |
1960 |
10,081,158 |
1970 |
11,110,285 |
1980 |
11,427,409 |
1990 |
11,430,602 |
2000 |
12,419,293 |
2010 |
12,830,632 |
2020 |
12,812,508 |
2030 |
12,709,901 |
2040 |
12,397,564 |
SOURCE: U.S. Bureau of the Census & Weldon Cooper Center, Demographics Research Group
(The Census Bureau and Weldon Cooper Center have not yet provided updated State projections to reflect 2020 census numbers.)
Population by County
County |
Census 2020 Population |
Census 2010 Population |
Change from 2010 |
Percent Change |
ILLINOIS |
12,812,508 |
12,830,632 |
-18,124 |
-0.14% |
Adams County |
65,737 |
67,103 |
-1,366 |
-2.04% |
Alexander County |
5,240 |
8,238 |
-2,998 |
-36.39% |
Bond County |
16,725 |
17,768 |
-1,043 |
-5.87% |
Boone County |
53,448 |
54,165 |
-717 |
-1.32% |
Brown County |
6,244 |
6,937 |
-693 |
-9.99% |
Bureau County |
33,244 |
34,978 |
-1,734 |
-4.96% |
Calhoun County |
4,437 |
5,089 |
-652 |
-12.81% |
Carroll County |
15,702 |
15,387 |
315 |
2.05% |
Cass County |
13,042 |
13,642 |
-600 |
-4.40% |
Champaign County |
205,865 |
201,081 |
4,784 |
2.38% |
Christian County |
34,032 |
34,800 |
-768 |
-2.21% |
Clark County |
15,455 |
16,335 |
-880 |
-5.39% |
Clay County |
13,288 |
13,815 |
-527 |
-3.81% |
Clinton County |
36,899 |
37,762 |
-863 |
-2.29% |
Coles County |
46,863 |
53,873 |
-7,010 |
-13.01% |
Cook County |
5,275,541 |
5,194,675 |
80,866 |
1.56% |
Crawford County |
18,679 |
19,817 |
-1,138 |
-5.74% |
Cumberland County |
10,450 |
11,048 |
-598 |
-5.41% |
DeKalb County |
100,420 |
105,160 |
-4,740 |
-4.51% |
De Witt County |
15,516 |
16,561 |
-1,045 |
-6.31% |
Douglas County |
19,740 |
19,980 |
-240 |
-1.20% |
DuPage County |
932,877 |
916,924 |
15,953 |
1.74% |
Edgar County |
16,866 |
18,576 |
-1,710 |
-9.21% |
Edwards County |
6,245 |
6,721 |
-476 |
-7.08% |
Effingham County |
34,668 |
34,242 |
426 |
1.24% |
Fayette County |
21,488 |
22,140 |
-652 |
-2.94% |
Ford County |
13,534 |
14,081 |
-547 |
-3.88% |
Franklin County |
37,804 |
39,561 |
-1,757 |
-4.44% |
Fulton County |
33,609 |
37,069 |
-3,460 |
-9.33% |
Gallatin County |
4,946 |
5,589 |
-643 |
-11.50% |
Greene County |
11,985 |
13,886 |
-1,901 |
-13.69% |
Grundy County |
52,533 |
50,063 |
2,470 |
4.93% |
Hamilton County |
7,993 |
8,457 |
-464 |
-5.49% |
Hancock County |
17,620 |
19,104 |
-1,484 |
-7.77% |
Hardin County |
3,649 |
4,320 |
-671 |
-15.53% |
Henderson County |
6,387 |
7,331 |
-944 |
-12.88% |
Henry County |
49,284 |
50,486 |
-1,202 |
-2.38% |
Iroquois County |
27,077 |
29,718 |
-2,641 |
-8.89% |
Jackson County |
52,974 |
60,218 |
-7,244 |
-12.03% |
Jasper County |
9,287 |
9,698 |
-411 |
-4.24% |
Jefferson County |
37,113 |
38,827 |
-1,714 |
-4.41% |
Jersey County |
21,512 |
22,985 |
-1,473 |
-6.41% |
Jo Daviess County |
22,035 |
22,678 |
-643 |
-2.84% |
Johnson County |
13,308 |
12,582 |
726 |
5.77% |
Kane County |
516,522 |
515,269 |
1,253 |
0.24% |
Kankakee County |
107,502 |
113,449 |
-5,947 |
-5.24% |
Kendall County |
131,869 |
114,736 |
17,133 |
14.93% |
Knox County |
49,967 |
52,919 |
-2,952 |
-5.58% |
Lake County |
714,342 |
703,462 |
10,880 |
1.55% |
La Salle County |
109,658 |
113,924 |
-4,266 |
-3.74% |
Lawrence County |
15,280 |
16,833 |
-1,553 |
-9.23% |
Lee County |
34,145 |
36,031 |
-1,886 |
-5.23% |
Livingston County |
35,815 |
38,950 |
-3,135 |
-8.05% |
Logan County |
27,987 |
30,305 |
-2,318 |
-7.65% |
McDonough County |
27,238 |
32,612 |
-5,374 |
-16.48% |
McHenry County |
310,229 |
308,760 |
1,469 |
0.48% |
McLean County |
170,954 |
169,572 |
1,382 |
0.81% |
Macon County |
103,998 |
110,768 |
-6,770 |
-6.11% |
Macoupin County |
44,967 |
47,765 |
-2,798 |
-5.86% |
Madison County |
265,859 |
269,282 |
-3,423 |
-1.27% |
Marion County |
37,729 |
39,437 |
-1,708 |
-4.33% |
Marshall County |
11,742 |
12,640 |
-898 |
-7.10% |
Mason County |
13,086 |
14,666 |
-1,580 |
-10.77% |
Massac County |
14,169 |
15,429 |
-1,260 |
-8.17% |
Menard County |
12,297 |
12,705 |
-408 |
-3.21% |
Mercer County |
15,699 |
16,434 |
-735 |
-4.47% |
Monroe County |
34,962 |
32,957 |
2,005 |
6.08% |
Montgomery County |
28,288 |
30,104 |
-1,816 |
-6.03% |
Morgan County |
32,915 |
35,547 |
-2,632 |
-7.40% |
Moultrie County |
14,526 |
14,846 |
-320 |
-2.16% |
Ogle County |
51,788 |
53,497 |
-1,709 |
-3.19% |
Peoria County |
181,830 |
186,494 |
-4,664 |
-2.50% |
Perry County |
20,945 |
22,350 |
-1,405 |
-6.29% |
Piatt County |
16,673 |
16,729 |
-56 |
-0.33% |
Pike County |
14,739 |
16,430 |
-1,691 |
-10.29% |
Pope County |
3,763 |
4,470 |
-707 |
-15.82% |
Pulaski County |
5,193 |
6,161 |
-968 |
-15.71% |
Putnam County |
5,637 |
6,006 |
-369 |
-6.14% |
Randolph County |
30,163 |
33,476 |
-3,313 |
-9.90% |
Richland County |
15,813 |
16,233 |
-420 |
-2.59% |
Rock Island County |
144,672 |
147,546 |
-2,874 |
-1.95% |
St. Clair County |
257,400 |
270,056 |
-12,656 |
-4.69% |
Saline County |
23,768 |
24,913 |
-1,145 |
-4.60% |
Sangamon County |
196,343 |
197,465 |
-1,122 |
-0.57% |
Schuyler County |
6,902 |
7,544 |
-642 |
-8.51% |
Scott County |
4,949 |
5,355 |
-406 |
-7.58% |
Shelby County |
20,990 |
22,363 |
-1,373 |
-6.14% |
Stark County |
5,400 |
5,994 |
-594 |
-9.91% |
Stephenson County |
44,630 |
47,711 |
-3,081 |
-6.46% |
Tazewell County |
131,343 |
135,394 |
-4,051 |
-2.99% |
Union County |
17,244 |
17,808 |
-564 |
-3.17% |
Vermilion County |
74,188 |
81,625 |
-7,437 |
-9.11% |
Wabash County |
11,361 |
11,947 |
-586 |
-4.90% |
Warren County |
16,835 |
17,707 |
-872 |
-4.92% |
Washington County |
13,761 |
14,716 |
-955 |
-6.49% |
Wayne County |
16,179 |
16,760 |
-581 |
-3.47% |
White County |
13,877 |
14,665 |
-788 |
-5.37% |
Whiteside County |
55,691 |
58,498 |
-2,807 |
-4.80% |
Will County |
696,355 |
677,560 |
18,795 |
2.77% |
Williamson County |
67,153 |
66,357 |
796 |
1.20% |
Winnebago County |
285,350 |
295,266 |
-9,916 |
-3.36% |
Woodford County |
38,467 |
38,664 |
-197 |
-0.51% |
SOURCE: U.S. Bureau of the Census
Illinois Population News Articles
Illinois city plans to source its future drinking water from Lake Michigan – Sept 30, 2024
IL bee population stunted by pesticides – Sept 27, 2024
Illinois to ban fluorescent lighting in 2026 – Sept 18, 2024
Chicago to close three shelters by end of October as migrant arrivals fall – Sept 12, 2024
Monarch butterfly numbers have dropped this summer in Illinois, experts say – Sept 8, 2024
Climate change to be required Illinois teaching, thanks to two Naperville students – Sept 6, 2024
11.9% of Illinois Residents Are Experiencing Drought Conditions in 2024 – Sept 4, 2024
Residents of Illinois town evacuate as officials warn of ‘imminent’ dam failure – July 16, 2024
Undocumented immigrants now eligible for standard Illinois driver’s licenses with “federal limits” – July 1, 2024
IRS: Illinois loses $10 billion in income from 87,000 people moving out – June 28th, 2024
Most new gas, diesel vehicle sales would be banned in Illinois by 2035 under proposal – June 27, 2024
Illinois is home to 2 of the Dirtiest Cities in America – June 26, 2024
Chicago-area severe weather prompts warnings from climate experts, calls to reduce water use – June 25, 2024
Goodbye, snowy Illinois winters? New climate report offers dry projections – November 20, 2023
Illinois earmarks $160 million to keep migrants warm in Chicago as winter approaches – November 17, 2023
Illinois takes major step toward lowering emissions, thanks to Ventura – November 16, 2023
The 8 Biggest Cities Located on the Shores of Lake Michigan – November 8, 2023
Report Examines Unequal Effects of Climate Change on Lake County Communities – October 26, 2023
Illinois EPA Invites 5th & 6th Grade Student Writers and Artists to Compete in Annual Poster, Poetry, and Prose Contest – October 25, 2023
Illinois has had the most tornadoes in the U.S. this year. Here’s why. – July 28, 2023
Chicago’s air quality: ‘We’re in the crosshairs.’ Wildfires and wind push region’s air to worst in the world, global pollution index shows. – June 27, 2023
State of Illinois expands air quality alert messaging statewide – Jul 25, 2023
Millions in Illinois Are Drinking Contaminated Water – June 29, 2023
Activists call for Chicago to rule out natural gas in new buildings, citing health risks, costs and climate change – January 19, 2023
Illinois making effort to reduce shoreline erosion – January 16, 2023
New State Water Plan spotlights 13 critical water-related challenges for Illinois – January 11, 2023
A 3M Plant in Illinois Was The Country’s Worst Emitter of a Climate-Killing ‘Immortal’ Chemical in 2021 – December 29, 2022
Illinois is leading in clean electricity, but it’s falling behind elsewhere, study says – July 30, 2022
From the Farm: Losing farmland – July 20, 2022
Illinois is converting coal plants to solar projects – July 14, 2022
Illinois Poised to Improve Public Health & Economy by Adopting Clean Truck Policies – July 11, 2022
8M Illinoisans get drinking water from a utility where forever chemicals have been detected, investigation finds – July 11, 2022
The Most Traveled Bridge in Illinois That Doesn’t Meet Safety Standards – March 27, 2022
Illinois AG files suit against Marathon over crude oil spill in Cahokia Creek – March 21, 2022
Farm Bureau opposes nutrient loss bill as negotiations continue – March 2, 2022
Chicago is no safe haven from climate change – March 1, 2022
Illinois — a major feeder to the Gulf of Mexico dead zone — falls behind federal goal to reduce phosphorus and nitrogen flowing into its waterways – December 20, 2021
Little Village residents slam city for failing to reduce influx of industry: ‘As if we don’t deserve clean air’ – December 16, 2021
Fall is heating up in Illinois cities – November 29, 2021
1 million EVs: Inside the state’s plan for electrifying the transportation sector – November 23, 2021
Fertilizer Runoff In Illinois Is Still On The Rise, Despite Program Designed To Slow It Down – September 24, 2021
Habitat Loss, Traffic Noise, Runoff: 143 St. Project Concerns – September 17, 2021
Illinois Passes Nation-Leading, Equitable Climate Bill – September 12, 2021
Sierra Club demands Springfield, CWLP establish an alert system for pollution incidents – September 7, 2021
As Climate Change Ramps Up Heat, Farmers Struggle To Keep Animals Cool – Aug 30, 2021
IL mosquito populations explode in wet summer after dry spring – July 13, 2021
ICC approves Ameren’s electric vehicle charging tariff – July 10, 2021
Lakefront Dump Site Opposed By Park Advocates, Southeast Siders Hasn’t Had A Valid Pollution Permit Since May 31 – June 30, 2021
As legislature reconvenes, Illinois is poised to become the first state in the Midwest to ban coal-burning power plants – June 15, 2021
This is How Much Renewable Energy Illinois is Producing – April 1, 2021
“Climate change is real;” Researchers warn extreme weather events could impact Illinois agriculture – March 31, 2021
Lax Oversight Of Coal Plant Demolitions Could Leave Illinois Communities Vulnerable – March 3, 2021