Chicagoland is a common name for the Chicago metropolitan area in the USA. Chicagoland comprises the city of Chicago, Cook County and the nine surrounding counties in the state of Illinois, five in Indiana, and one in Wisconsin. "Chicagoland" is often used in place of "Chicago metropolitan area" by local residents, businesses, governments, and planning agencies. The term originated in the pages of the Chicago Tribune in the 1900s.
The suburbs, surrounded by easily annexed flat ground, have been expanding at a tremendous rate since the early 1960s. Naperville is noteworthy for being one of only two boomburbs outside the Sunbelt, West Coast, and Mountain States regions (though Bolingbrook may join it in the next decade), and exurban Kendall County ranked as the third fastest-growing county in the United States with a population greater than 10,000 between 2004 and 2005.* Settlement patterns in Chicagoland tend to follow those in the city proper: the northern suburbs along the shore of Lake Michigan are comparatively affluent, while the southern suburbs are less so, with lower median incomes and a lower cost of living. There are affluent areas in the northwest and western suburbs as well, that rival the northern suburbs. The southern portion of Chicagoland is occasionally called Illiana, a contraction of Illinois and Indiana.
Within the boundary of the 16-county Chicago Consolidated Statistical Area lies the Chicago urban area, as well as 27 smaller urban areas and clusters.
| Rank | Urban Area or Urban Cluster | type | Population (2000 census) | Land Area (km²) | Smallest gap (km) |
|---|---|---|---|---|---|
| 1 | Chicago-Aurora-Elgin-Joliet-Waukegan, IL-IN | UA | 8,307,904 | 5,498.1 | n/a |
| 2 | Round Lake Beach-McHenry-Grayslake, IL-WI^ (+) | UA | 226,848 | 344.9 | 2 |
| 3 | Kenosha, WI (+) | UA | 110,942 | 109.2 | 1 |
| 4 | Michigan City-LaPorte, IN-MI^^ (+) | UA | 66,199 | 86.1 | 3 |
| 5 | Kankakee-Bradley-Bourbonnais, IL | UA | 65,073 | 71.5 | >10 |
| 6 | DeKalb-Sycamore, IL | UA | 55,805 | 46.3 | >10 |
| 7 | Woodstock, IL (+) | UC | 20,219 | 21.1 | 4 |
| 8 | Morris, IL | UC | 13,927 | 19.3 | >10 |
| 9 | Sandwich, IL^^^ | UC | 12,248 | 23.9 | >10 |
| 10 | Braidwood-Coal City, IL | UC | 11,607 | 19.5 | >10 |
| 11 | Harvard, IL | UC | 8,575 | 13.3 | >10 |
| 12 | Lakes of the Four Seasons, IN (+) | UC | 8,450 | 12.5 | 4 |
| 13 | Lowell, IN | UC | 7,914 | 15.8 | >10 |
| 14 | Wilmington, IL | UC | 7,107 | 20.8 | >10 |
| 15 | Manteno, IL | UC | 7,106 | 9.4 | >10 |
| 16 | Marengo, IL | UC | 6,854 | 8.6 | >10 |
| 17 | Rensselaer, IN | UC | 6,096 | 10.9 | >10 |
| 18 | Plano, IL (+) | UC | 5,911 | 6.5 | 3 |
| 19 | Genoa, IL | UC | 5,137 | 5.5 | >10 |
| 20 | Genoa City, WI-IL^^^^ (+) | UC | 5,126 | 12.5 | >10 |
| 21 | Westville, IN | UC | 5,077 | 4.4 | >10 |
| 22 | Hebron, IN | UC | 4,150 | 11.7 | >10 |
| 23 | Momence, IL | UC | 3,711 | 9.7 | >10 |
| 24 | Peotone, IL (+) | UC | 3,358 | 3.5 | 9 |
| 25 | Wonder Lake, IL (+) | UC | 2,798 | 2.0 | 5 |
| 26 | Monee, IL (+) | UC | 2,787 | 3.7 | 3 |
| 27 | Union township, IN (+) | UC | 2,593 | 4.9 | 1 |
| 28 | Hampshire, IL (+) | UC | 2,591 | 2.0 | 6 |
The formerly distinct urban areas of Aurora, Elgin, Joliet, and Waukegan were absorbed into the Chicago UA as of the 2000 census.
(+) These urban areas and urban clusters are expected to be joined to the Chicago Urban Area by the next census in 2010.
^ The Round Lake Beach-McHenry-Grayslake, IL-WI UA extends into Walworth County, WI, which lies (for the moment) outside the Chicago CSA.
^^ The Michigan City-LaPorte, IN-MI UA extends into Berrien County, MI, which lies (for the moment) outside the Chicago CSA.
^^^ The Sandwich, IL UC extends into LaSalle County, IL, which lies (for the moment) outside the Chicago CSA.
^^^^ The Genoa City, WI-IL UC extends into Walworth County, WI, which lies (for the moment) outside the Chicago CSA.
Metropolitan areas of the United States | Chicago, Illinois | Chicago metropolitan area
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"Chicagoland".
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