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Historical population
Year
Pop.
±% p.a.
1800
2,458
—
1810
12,282
+17.45%
1820
55,211
+16.22%
1830
157,445
+11.05%
1840
476,183
+11.70%
1850
851,470
+5.98%
1860
1,711,951
+7.23%
1870
2,539,891
+4.02%
1880
3,077,871
+1.94%
1890
3,826,352
+2.20%
1900
4,821,550
+2.34%
1910
5,638,591
+1.58%
1920
6,485,280
+1.41%
1930
7,630,654
+1.64%
1940
7,897,241
+0.34%
1950
8,712,176
+0.99%
1960
10,081,158
+1.47%
1970
11,113,976
+0.98%
1980
11,426,518
+0.28%
1990
11,430,602
+0.00%
2000
12,419,293
+0.83%
2010
12,830,632
+0.33%
2020
12,812,508
−0.01%
Source: 1910–2020[1]
The history of Illinois may be defined by several broad historical periods, namely, the pre-Columbian period, the era of European exploration and colonization, its development as part of the American frontier, its early statehood period, growth in the 19th and 20th centuries, and contemporary Illinois of today.
^"Historical Population Change Data (1910–2020)". Census.gov. United States Census Bureau. Archived from the original on April 29, 2021. Retrieved May 1, 2021.
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