------------------------------------------------------------------------------------------------------------------------- Chicago, IL ------------------------------------------------------------------------------------------------------------------------- 1959-1983: Chicago, IL SMSA in Chicago-Northestern Indiana, IL-IN SCSA 1983-1992: Chicago, IL PMSA in Chicago-Gary-Lake County, IL-IN-WI CMSA 1992-2003: Chicago, IL PMSA in Chicago-Gary-Kenosha, IL-IN-WI CMSA 2003-2006: Chicago-Naperville-Joliet, IL Metro Division in Chicago-Naperville-Joliet, IL Metro Area in Chicago-Naperville-Michigan City, IL-IN-WI CSA Population History ------------------------------------------------------------------------------------------------------------------------- Component 1950 1960 1970 1980 1990 2000 2005 ------------------------------------------------------------------------------------------------------------------------- Cook County, IL 4,508,792 5,129,725* 5,492,369* 5,253,655* 5,105,067* 5,376,741* 5,303,943* DeKalb County, IL 40,781 51,714 71,654 74,624 77,932 88,969* 97,770* DuPage County, IL 154,599 313,459* 491,882* 658,835* 781,666* 904,161* 931,219* Grundy County, IL 19,217 22,350 26,535 30,582 32,337 37,535* 43,736* Kane County, IL 150,388 208,246* 251,005* 278,405* 317,471 404,119* 483,208* Kendall County, IL 12,115 17,540 26,374 37,202 39,413 54,544* 79,597* Lake County, IL 179,097 293,656* 382,638* 440,372* 516,418 644,356* 704,086 McHenry County, IL 50,656 84,210* 111,555* 147,897* 183,241* 260,077* 304,701* Will County, IL 134,336 191,617* 249,498* 324,460* 357,313 502,266* 642,625* ------------------------------------------------------------------------------------------------------------------------- Total - 6,220,913 6,978,947 7,103,624 6,069,974 8,272,768 7,886,799 Percent Change - - 12.2% 1.8% -14.6% 36.3% -4.7% ------------------------------------------------------------------------------------------------------------------------- Total (as currently defined) 5,070,884 6,018,861 6,720,872 6,805,660 6,894,440 7,628,412 7,886,799 Percent Change - 18.7% 11.7% 1.3% 1.3% 10.6% 3.4% ------------------------------------------------------------------------------------------------------------------------- Component Change Timeline ---------------------------------------------------------------------------------------- 1950 1960 1970 1980 1990 2000 Component | | | | | | | | | | | | ---------------------------------------------------------------------------------------- Cook County, IL '''''''''************************************************ DeKalb County, IL *************** DuPage County, IL '''''''''************************************************ Grundy County, IL '''''''''*************** Kane County, IL '''''''''************************'''''''''*************** Kendall County, IL '''''''''*************** Lake County, IL '''''''''************************'''''''''***********'''' McHenry County, IL ************************************************ Will County, IL '''''''''************************'''''''''*************** ---------------------------------------------------------------------------------------- Population History ------------------------------------------------------------------------------------------------------------------------- City 1950 1960 1970 1980 1990 2000 2005 ------------------------------------------------------------------------------------------------------------------------- Chicago, IL 0 3,550,404* 3,366,957* 3,005,072* 2,783,726* 2,896,016* 2,842,518* Chicago Heights, IL 0 34,331 40,900 37,026 33,072* 32,776 31,373 Evanston, IL 0 79,283 79,808 73,706 73,233* 74,239* 75,236* DeKalb, IL 0 0 0 0 0 39,018* 42,085 Joliet, IL 0 66,780 80,378 77,956 0 106,221* 136,208* North Chicago, IL 0 22,938 47,275 38,774 0 35,918* 0 Aurora, IL 0 63,715 74,182 81,293 14,811 142,990* 168,181 Elgin, IL 0 49,447 55,691 63,798 15,400 94,487* 98,645* Arlington Heights, IL 0 27,878 65,058 66,116 75,460 76,031 74,619* Des Plaines, IL 0 34,886 57,239 53,568 53,223 58,720 56,551* Naperville, IL 0 12,933 23,885 42,330 72,931 128,358 141,579* Schaumburg, IL 0 986 18,730 53,305 68,586 75,386 72,805* Skokie, IL 0 59,364 68,322 60,278 59,432 63,348 64,678* Total 0 3,550,404 3,366,957 3,005,072 2,890,031 3,388,889 3,562,839 Metro 0 6,220,913 6,978,947 7,103,624 6,069,974 8,272,768 7,886,799 Percent 57.1% 48.2% 42.3% 47.6% 41.0% 45.2% Principal/Central City Change Timeline ---------------------------------------------------------------------------------------- 1950 1960 1970 1980 1990 2000 City | | | | | | | | | | | | ---------------------------------------------------------------------------------------- Chicago, IL ************************************************ Chicago Heights, IL ********* Evanston, IL ************************ DeKalb, IL *********** Joliet, IL *************** North Chicago, IL *********** Aurora, IL ********** Elgin, IL ************** Arlington Heights, IL **** Des Plaines, IL **** Naperville, IL **** Schaumburg, IL **** Skokie, IL **** ---------------------------------------------------------------------------------------- Component Change History ------------------------------------------------------------------------------------------------------------------------- Apr 1950 Cook County, IL included as original component of Chicago, IL-IN SMA DuPage County, IL included as original component of Chicago, IL-IN SMA Kane County, IL included as original component of Chicago, IL-IN SMA Lake County, IL included as original component of Chicago, IL-IN SMA Will County, IL included as original component of Chicago, IL-IN SMA Chicago, IL designated as original central city of new Chicago, IL-IN SMA Jun 1959 New SMSA: Chicago, IL SMSA in Chicago-Northestern Indiana, IL-IN SCSA Cook County, IL included as original SMSA component, transferred from Chicago, IL-IN SMA DuPage County, IL included as original SMSA component, transferred from Chicago, IL-IN SMA Kane County, IL included as original SMSA component, transferred from Chicago, IL-IN SMA Lake County, IL included as original SMSA component, transferred from Chicago, IL-IN SMA McHenry County, IL included as original SMSA component Will County, IL included as original SMSA component, transferred from Chicago, IL-IN SMA Chicago, IL designated as original central city of new SMSA, transferred from Chicago, IL-IN SMA Jun 1983 Aurora, IL designated as original central city of new Aurora-Elgin, IL PMSA in Chicago-Gary-Lake County, IL-IN-WI CMSA Elgin, IL designated as original central city of new Aurora-Elgin, IL PMSA in Chicago-Gary-Lake County, IL-IN-WI CMSA Chicago, IL SMSA in Chicago-Northestern Indiana, IL-IN SCSA became Chicago, IL PMSA in Chicago-Gary-Lake County, IL-IN-WI CMSA Grundy County, IL included as original component of Joliet, IL PMSA in Chicago-Gary-Lake County, IL-IN-WI CMSA Kane County, IL included as original component of Aurora-Elgin, IL PMSA in Chicago-Gary-Lake County, IL-IN-WI CMSA Kendall County, IL included as original component of Aurora-Elgin, IL PMSA in Chicago-Gary-Lake County, IL-IN-WI CMSA Lake County, IL included as original component of Lake County, IL PMSA in Chicago-Gary-Lake County, IL-IN-WI CMSA Will County, IL included as original component of Joliet, IL PMSA in Chicago-Gary-Lake County, IL-IN-WI CMSA Chicago Heights, IL designated as central city of PMSA Evanston, IL designated as central city of PMSA Joliet, IL designated as original central city of new Joliet, IL PMSA in Chicago-Gary-Lake County, IL-IN-WI CMSA North Chicago, IL designated as original central city of new Lake County, IL PMSA in Chicago-Gary-Lake County, IL-IN-WI CMSA Dec 1992 DeKalb County, IL added Grundy County, IL added, transferred from Joliet, IL PMSA in Chicago-Gary-Lake County, IL-IN-WI CMSA Kane County, IL added, transferred from Aurora-Elgin, IL PMSA in Chicago-Gary-Lake County, IL-IN-WI CMSA Kendall County, IL added, transferred from Aurora-Elgin, IL PMSA in Chicago-Gary-Lake County, IL-IN-WI CMSA Lake County, IL added, transferred from Lake County, IL PMSA in Chicago-Gary-Lake County, IL-IN-WI CMSA Will County, IL added, transferred from Joliet, IL PMSA in Chicago-Gary-Lake County, IL-IN-WI CMSA DeKalb, IL designated as central city of PMSA Joliet, IL designated as central city of PMSA, transferred from Joliet, IL PMSA in Chicago-Gary-Lake County, IL-IN-WI CMSA North Chicago, IL designated as central city of PMSA, transferred from Lake County, IL PMSA in Chicago-Gary-Lake County, IL-IN-WI CMSA Aurora, IL no longer designated as central city of Aurora-Elgin, IL PMSA in Chicago-Gary-Lake County, IL-IN-WI CMSA Chicago Heights, IL no longer designated as central city Elgin, IL no longer designated as central city of Aurora-Elgin, IL PMSA in Chicago-Gary-Lake County, IL-IN-WI CMSA Jun 1993 Aurora, IL designated as central city of PMSA Elgin, IL designated as central city of PMSA Jun 2003 Title of Chicago, IL PMSA in Chicago-Gary-Kenosha, IL-IN-WI CMSA changed to Chicago-Naperville-Joliet, IL Metro Division in Chicago-Naperville-Joliet, IL Metro Area in Chicago-Naperville-Michigan City, IL-IN-WI CSA Lake County, IL included as original component of reestablished Lake County-Kenosha County, IL-WI Metro Division in Chicago-Naperville-Joliet, IL Metro Area in Chicago-Naperville-Michigan City, IL-IN-WI CSA Arlington Heights, IL designated as principal city of Metro Division Des Plaines, IL designated as principal city of Metro Division Naperville, IL designated as principal city of Metro Division Schaumburg, IL designated as principal city of Metro Division Skokie, IL designated as principal city of Metro Division Aurora, IL no longer designated as principal/central city DeKalb, IL no longer designated as principal/central city North Chicago, IL no longer designated as principal/central city -------------------------------------------------------------------------------------------------------------------------