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The last county, Ford County, was created in 1859. Cook County, established in 1831 and named for the early Illinois Attorney General Daniel Pope Cook, contained the absolute majority of the state's population in the first half of the 20th century and retains more than 40% of it as of the 2020 census.
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.
Locally, Sangamon County saw a decrease from July 1 of 2020 to 2023 of 196,144 to 193,491, or 1.35% of the county's population was lost. An aerial view of Springfield is seen on Monday, April 1, 2024.
The Office of Management and Budget (OMB) has designated more than 1,000 statistical areas for the United States and Puerto Rico. [2] These statistical areas are important geographic delineations of population clusters used by the OMB, the United States Census Bureau, planning organizations, and federal, state, and local government entities.
Thursday’s numbers show Illinois’ population in 2020 was 12.79 million people. The following year, the state was 12.70 million people. ... Thursday’s Census update has the population ...
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Pope County is the southeasternmost county in the U.S. state of Illinois. According to the 2020 census , it had a population of 3,763, [ 1 ] making it the second-least populous county in Illinois. Its county seat is Golconda . [ 2 ]
Peoria County is located in the U.S. state of Illinois. The 2020 United States census listed its population at 181,830. [ 1 ] Its county seat is Peoria . [ 2 ]