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Illinois' population slightly declined in 2020 from the 2010 United States census by just over 18,000 residents and the overall population was quite higher than recent census estimates. [86] Illinois 2020 Population Density Map. Illinois is the most populous state in the Midwest region.
The history of Illinois may be defined by several broad historical periods, namely, the pre-Columbian period, the era of European exploration and colonization, its development as part of the American frontier, its early statehood period, growth in the 19th and 20th centuries, and contemporary Illinois of today.
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 ...
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]
The Government of Illinois, under Illinois ' Constitution, has three branches of government: Executive, Legislative, and Judicial. The State's executive branch is split into several statewide elected offices, with the Governor as chief executive and head of state, and has numerous departments, agencies, boards and commissions.
The Illinois Portal. The flag of Illinois. Illinois ( / ˌɪlɪˈnɔɪ / ⓘ IL-in-OY) is a state in the Midwestern region of the United States. It borders Lake Michigan to its northeast, the Mississippi River to its west, and the Wabash and Ohio rivers to its south. Of the fifty U.S. states, Illinois has the fifth-largest gross domestic ...
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.
Springfield, Illinois. Springfield is the capital city of the U.S. state of Illinois and the seat of Sangamon County. The city's population was 114,394 at the 2020 census, which makes it the state's seventh-most populous city, [ 10 ] the second-most populous outside of the Chicago metropolitan area (after Rockford ), and the most populous in ...