St. Clair County, IL Population and Components of Change
| Date |
Population |
% Change |
Components of Change |
Total Population Change |
Births |
Deaths |
Inter- national Immigra- tion |
Net Domestic Migration |
| 1970 | 285,591 | - | - |
- | - | - | - |
| 1971 | 282,300 | -1.2 | -3,291 |
- | - | - | - |
| 1972 | 284,700 | 0.9 | 2,400 |
- | - | - | - |
| 1973 | 280,800 | -1.4 | -3,900 |
- | - | - | - |
| 1974 | 275,900 | -1.7 | -4,900 |
- | - | - | - |
| 1975 | 274,700 | -0.4 | -1,200 |
- | - | - | - |
| 1976 | 273,400 | -0.5 | -1,300 |
- | - | - | - |
| 1977 | 271,200 | -0.8 | -2,200 |
- | - | - | - |
| 1978 | 271,800 | 0.2 | 600 |
- | - | - | - |
| 1979 | 271,700 | 0.0 | -100 |
- | - | - | - |
| 1980 | 267,531 | -1.5 | -4,169 |
- | - | - | - |
| 1981 | 267,050 | -0.2 | -481 |
6,139 | 3,329 | - | - |
| 1982 | 266,073 | -0.4 | -977 |
4,872 | 2,626 | - | - |
| 1983 | 265,569 | -0.2 | -504 |
4,754 | 2,565 | - | - |
| 1984 | 265,028 | -0.2 | -541 |
4,677 | 2,527 | - | - |
| 1985 | 265,155 | 0.0 | 127 |
4,739 | 2,572 | - | - |
| 1986 | 266,545 | 0.5 | 1,390 |
4,729 | 2,641 | - | - |
| 1987 | 266,527 | 0.0 | -18 |
4,611 | 2,627 | - | - |
| 1988 | 264,487 | -0.8 | -2,040 |
4,590 | 2,671 | - | - |
| 1989 | 263,821 | -0.3 | -666 |
4,649 | 2,683 | - | - |
| 1990 | 262,852 | -0.4 | -969 |
3,541 | 1,980 | - | - |
| 1991 | 261,785 | -0.4 | -1,067 |
5,732 | 3,295 | 141 | -3,108 |
| 1992 | 261,689 | 0.0 | -96 |
4,358 | 2,571 | 110 | -2,097 |
| 1993 | 264,082 | 0.9 | 2,393 |
4,429 | 2,611 | 86 | 464 |
| 1994 | 263,606 | -0.2 | -476 |
4,289 | 2,750 | 93 | -1,834 |
| 1995 | 262,499 | -0.4 | -1,107 |
4,098 | 2,700 | 64 | -2,029 |
| 1996 | 261,907 | -0.2 | -592 |
3,985 | 2,622 | 66 | -2,013 |
| 1997 | 260,631 | -0.5 | -1,276 |
3,776 | 2,650 | 64 | -2,235 |
| 1998 | 258,286 | -0.9 | -2,345 |
3,683 | 2,645 | 76 | -3,161 |
| 1999 | 256,201 | -0.8 | -2,085 |
3,782 | 2,695 | 59 | -2,886 |
| 2000 | 256,082 | 0.0 | -119 |
- | - | - | - |
| 2001 | 255,895 | -0.1 | -187 |
4,633 | 3,127 | 186 | -2,022 |
| 2002 | 257,075 | 0.5 | 1,180 |
3,732 | 2,584 | -212 | 168 |
| 2003 | 257,691 | 0.2 | 616 |
3,621 | 2,677 | -910 | 772 |
| 2004 | 258,338 | 0.3 | 647 |
3,726 | 2,602 | 557 | -1,082 |
| 2005 | 258,776 | 0.2 | 438 |
3,696 | 2,542 | 143 | -1,013 |
| 2006 | 260,470 | 0.7 | 1,694 |
3,740 | 2,493 | 330 | -326 |
| 2007 | 261,467 | 0.4 | 997 |
3,874 | 2,526 | 11 | -368 |
| 2008 | 262,291 | 0.3 | 824 |
3,927 | 2,529 | 141 | -802 |
Note: Decade years represent April 1, Census data, not the mid-year estimates.
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