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A 2012 survey of the urban trees and forests in the seven county Illinois section of the Chicago area found that 21% of the land is covered by the tree and shrub canopy, made up of about 157,142,000 trees. The five most common tree species are buckthorn, green ash, boxelder, black cherry, and American elm. These resources perform important ...
According to the 2020 United States census, Illinois is the 6th most populous state with 12,812,508 inhabitants but the 24th largest by land area spanning 55,499.0 square miles (143,742 km 2) of land. [1] Illinois is divided into 102 counties and, as of 2020, contained 1,300 municipalities consisting of cities, towns, and villages.
There are 102 counties in Illinois. The most populous of these is Cook County, the second-most populous county in the United States and the home of Chicago, while the least populous is Hardin County. The largest by land area is McLean County, while the smallest is Putnam County. Illinois's FIPS state code is 17 and its postal abbreviation is IL.
Collar counties is a colloquialism for DuPage, Kane, Lake, McHenry, and Will counties, the five counties of Illinois that border Cook County, which is home to Chicago. The collar counties are part of the Chicago metropolitan area and comprise many of the area's suburbs .
This category is for the Chicago metropolitan area, including populated places, and sub-categories for populated places over 30,000; counties; regions; and sub-regions. Contents Top
Located in far northern Illinois on the banks of the Rock River, Rockford is the county seat of Winnebago County (with a small portion of the city located in Ogle County). The population was 148,655 at the 2020 census , making Rockford the fifth-most populous city in Illinois, as well as the state's most populous city outside of the Chicago ...
According to the U.S. Census Bureau, the county has a total area of 1,635 square miles (4,230 km 2), of which 945 square miles (2,450 km 2) is land and 690 square miles (1,800 km 2) (42.2%) is water. [26] It is the sixth largest county in Illinois by land area, and the largest in total area. Most of the water is in Lake Michigan.
According to the 2020 census, it has a population of 516,522, [2] making it the fifth-most populous county in Illinois. Its county seat is Geneva, [3] and its largest city is Aurora. Kane County is one of the collar counties of the metropolitan statistical area designated "Chicago–Naperville–Elgin, IL–IN–WI" by the US census.