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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.
Map of the United States with Illinois highlighted Illinois is a state located in the Midwestern United States . 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 has a maximum north–south distance of 390 miles (630 km) and 210 miles (340 km) east-west. Total area is 57,918 square miles (150,010 km 2 ), ranked 25th in size of the 50 states. Water area is 2,325 square miles (6,020 km 2 ); Lake Michigan accounts for most of this. Charles Mound in the northwest Driftless Area is the highest point ...
LaSalle County is a county located within the Fox Valley and Illinois River Valley regions of the U.S. state of Illinois. As of the 2020 Census, it had a population of 109,658. [ 3 ] Its county seat and largest city is Ottawa. [ 4 ] LaSalle County is part of the Ottawa, IL Micropolitan Statistical Area of Northern Illinois .
Woodford County, Illinois. / 40.79°N 89.21°W / 40.79; -89.21. Woodford County is a county located in the state of Illinois. The 2020 United States Census listed its population at 38,467. [ 1] Its county seat is Eureka. [ 2] Woodford County is part of the Peoria, IL, Metropolitan Statistical Area.
www .oglecounty .org. Ogle County is a county in the northern part of the U.S. state of Illinois. According to the 2020 United States Census, it had a population of 51,788. [ 1] Its county seat is Oregon, [ 2] and its largest city is Rochelle. Ogle County comprises Rochelle, IL Micropolitan Statistical Area, which is also included in the ...
Grundy County, Illinois. / 41.29°N 88.43°W / 41.29; -88.43. Grundy County is a county in the U.S. state of Illinois. According to the 2020 census, it has a population of 52,533. [ 1] Its county seat is Morris. [ 2] Grundy County is part of the Chicago - Naperville - Elgin, IL- IN - WI Metropolitan Statistical Area .
This is a map showing Illinois counties Modification of David Benbennick's map. For more information, see Commons:United States county locator maps . {{PD-self}} Maps of Illinois]]