Illinois - Population
| Date | Density | Population |
|---|---|---|
| 2023 | 84 | 12,549,689 |
| 2022 | 84 | 12,582,515 |
| 2021 | 85 | 12,690,341 |
| 2020 | 85 | 12,790,357 |
| 2019 | 86 | 12,850,150 |
| 2018 | 86 | 12,888,646 |
| 2017 | 86 | 12,924,504 |
| 2016 | 86 | 12,946,698 |
| 2015 | 86 | 12,964,764 |
| 2014 | 86 | 12,970,348 |
| 2013 | 86 | 12,960,987 |
| 2012 | 86 | 12,928,106 |
| 2011 | 86 | 12,892,740 |
| 2010 | 86 | 12,845,511 |
| 2009 | 85 | 12,796,778 |
| 2008 | 85 | 12,747,038 |
| 2007 | 85 | 12,695,866 |
| 2006 | 84 | 12,643,955 |
| 2005 | 84 | 12,609,903 |
| 2004 | 84 | 12,589,773 |
| 2003 | 84 | 12,556,006 |
| 2002 | 84 | 12,525,556 |
| 2001 | 83 | 12,488,445 |
| 2000 | 83 | 12,434,161 |
| 1999 | 82 | 12,359,020 |
| 1998 | 82 | 12,271,847 |
| 1997 | 81 | 12,185,715 |
| 1996 | 81 | 12,101,997 |
| 1995 | 80 | 12,008,437 |
| 1994 | 79 | 11,912,585 |
| 1993 | 79 | 11,809,579 |
| 1992 | 78 | 11,694,184 |
| 1991 | 77 | 11,568,964 |
| 1990 | 76 | 11,453,316 |
| 1989 | 76 | 11,409,782 |
| 1988 | 76 | 11,390,186 |
| 1987 | 76 | 11,391,176 |
| 1986 | 76 | 11,387,256 |
| 1985 | 76 | 11,399,803 |
| 1984 | 76 | 11,412,128 |
| 1983 | 76 | 11,408,817 |
| 1982 | 76 | 11,423,413 |
| 1981 | 76 | 11,443,461 |
| 1980 | 76 | 11,434,702 |
| 1979 | 76 | 11,422,782 |
| 1978 | 76 | 11,434,421 |
| 1977 | 76 | 11,406,312 |
| 1976 | 76 | 11,360,274 |
| 1975 | 75 | 11,306,351 |
| 1974 | 75 | 11,273,745 |
| 1973 | 75 | 11,260,248 |
| 1972 | 75 | 11,258,111 |
| 1971 | 75 | 11,205,816 |
| 1970 | 74 | 11,124,681 |
| 1969 | 74 | 11,039,000 |
| 1968 | 73 | 10,995,000 |
| 1967 | 73 | 10,947,000 |
| 1966 | 72 | 10,836,000 |
| 1965 | 71 | 10,693,000 |
| 1964 | 71 | 10,580,000 |
| 1963 | 69 | 10,402,000 |
| 1962 | 69 | 10,280,000 |
| 1961 | 68 | 10,130,000 |
| 1960 | 67 | 10,086,000 |
| 1959 | 67 | 9,986,000 |
| 1958 | 66 | 9,886,000 |
| 1957 | 64 | 9,668,000 |
| 1956 | 64 | 9,530,000 |
| 1955 | 63 | 9,435,000 |
| 1954 | 62 | 9,252,000 |
| 1953 | 60 | 9,065,000 |
| 1952 | 60 | 8,956,000 |
| 1951 | 59 | 8,790,000 |
| 1950 | 58 | 8,738,000 |
| 1949 | 58 | 8,670,000 |
| 1948 | 57 | 8,552,000 |
| 1947 | 56 | 8,344,000 |
| 1946 | 54 | 8,164,000 |
| 1945 | 51 | 7,612,000 |
| 1944 | 51 | 7,718,000 |
| 1943 | 52 | 7,765,000 |
| 1942 | 54 | 8,054,000 |
| 1941 | 53 | 7,995,000 |
| 1940 | 53 | 7,905,000 |
| 1939 | 53 | 7,890,000 |
| 1938 | 52 | 7,866,000 |
| 1937 | 52 | 7,857,000 |
| 1936 | 52 | 7,840,000 |
| 1935 | 52 | 7,797,000 |
| 1934 | 52 | 7,772,000 |
| 1933 | 52 | 7,768,000 |
| 1932 | 52 | 7,736,000 |
| 1931 | 51 | 7,687,000 |
| 1930 | 51 | 7,644,000 |
| 1929 | 51 | 7,606,000 |