Illinois - Population
| Date | Density | Population |
|---|---|---|
| 2022 | 84 | 12,582,000 |
| 2021 | 85 | 12,686,500 |
| 2020 | 85 | 12,786,600 |
| 2019 | 86 | 12,850,200 |
| 2018 | 86 | 12,888,600 |
| 2017 | 86 | 12,924,500 |
| 2016 | 86 | 12,946,700 |
| 2015 | 86 | 12,964,800 |
| 2014 | 86 | 12,970,300 |
| 2013 | 86 | 12,961,000 |
| 2012 | 86 | 12,928,100 |
| 2011 | 86 | 12,892,700 |
| 2010 | 86 | 12,845,500 |
| 2009 | 85 | 12,796,800 |
| 2008 | 85 | 12,747,000 |
| 2007 | 85 | 12,695,900 |
| 2006 | 84 | 12,644,000 |
| 2005 | 84 | 12,609,900 |
| 2004 | 84 | 12,589,800 |
| 2003 | 84 | 12,556,000 |
| 2002 | 84 | 12,525,600 |
| 2001 | 83 | 12,488,400 |
| 2000 | 83 | 12,434,200 |
| 1999 | 82 | 12,359,000 |
| 1998 | 82 | 12,271,800 |
| 1997 | 81 | 12,185,700 |
| 1996 | 81 | 12,102,000 |
| 1995 | 80 | 12,008,400 |
| 1994 | 79 | 11,912,600 |
| 1993 | 79 | 11,809,600 |
| 1992 | 78 | 11,694,200 |
| 1991 | 77 | 11,569,000 |
| 1990 | 76 | 11,453,300 |
| 1989 | 76 | 11,409,800 |
| 1988 | 76 | 11,390,200 |
| 1987 | 76 | 11,391,200 |
| 1986 | 76 | 11,387,300 |
| 1985 | 76 | 11,399,800 |
| 1984 | 76 | 11,412,100 |
| 1983 | 76 | 11,408,800 |
| 1982 | 76 | 11,423,400 |
| 1981 | 76 | 11,443,500 |
| 1980 | 76 | 11,434,700 |
| 1979 | 76 | 11,422,800 |
| 1978 | 76 | 11,434,400 |
| 1977 | 76 | 11,406,300 |
| 1976 | 76 | 11,360,300 |
| 1975 | 75 | 11,306,400 |
| 1974 | 75 | 11,273,700 |
| 1973 | 75 | 11,260,200 |
| 1972 | 75 | 11,258,100 |
| 1971 | 75 | 11,205,800 |
| 1970 | 74 | 11,124,700 |
| 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 |