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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 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.
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.
As of the 2020 United States census, there were 65,737 people, 27,199 households, and 17,398 families residing in the county. [11] The population density was 75.5 inhabitants per square mile (29.2/km 2). There were 30,235 housing units at an average density of 34.7 per square mile (13.4/km 2). The racial makeup of the county was 89.5% white, 3. ...
Thursday’s numbers show Illinois’ population in 2020 was 12.79 million people. The following year, the state was 12.70 million people. In 2022, Illinois continued to shrink with 12.62 million ...
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