Population history for Grayslake
| Year | Estimated Population |
|---|
|
2011
|
21,042
|
|
2010
|
20,988
|
|
2009
|
21,698
|
|
2008
|
21,711
|
|
2007
|
21,605
|
|
2006
|
21,375
|
|
2005
|
21,093
|
|
2004
|
20,457
|
|
2003
|
20,137
|
|
2002
|
20,152
|
|
2001
|
19,530
|
|
2000
|
18,734
|
|
1999
|
16,572
|
|
1998
|
16,090
|
|
1997
|
15,380
|
|
1996
|
14,456
|
|
1995
|
13,111
|
|
1994
|
11,769
|
|
1993
|
10,526
|
|
1992
|
9,278
|
|
1991
|
8,074
|
|
1990
|
7,800
|