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  1. Including its lake area, Cook County has a total area of 1,635 square miles (4,234.6 km 2), the largest county in Illinois, of which 945 square miles (2,447.5 km 2) is land and 690 square miles (1,787.1 km 2) (42.16%) is water. Land-use in Cook County is mostly urban and densely populated.

  2. Cook County, Illinois has 944.9 square miles of land area and is the 6th largest county in Illinois by total area.

  3. Cook County, Illinois's estimated 2024 population is 5,062,578 with a growth rate of -0.48% in the past year according to the most recent United States census data. Cook County, Illinois is the largest county in Illinois. The 2010 population was 5,198,977 and has seen a growth of -2.62% since that time.

    Year
    Population
    Growth
    Growth Rate
    2029
    4,940,108
    -24,494
    -0.49%
    2028
    4,964,602
    -24,494
    -0.49%
    2027
    4,989,096
    -24,494
    -0.49%
    2026
    5,013,590
    -24,494
    -0.49%
  4. In 2022, Cook County, IL had a population of 5.23M people with a median age of 37.5 and a median household income of $78,304. Between 2021 and 2022 the population of Cook County, IL declined from 5.27M to 5.23M, a −0.76% decrease and its median household income grew from $72,121 to $78,304, a 8.57% increase.

  5. Jul 1, 2022 · Cook County, Illinois. QuickFacts provides statistics for all states and counties, and for cities and towns with a population of 5,000 or more.

    • (800) 923-8282
    • 5,583.0
    • 5,495.1
    • 5,194,675
  6. Jun 18, 2024 · Its largest annual population increase was 2.3% between 2019 and 2020. The county ’s largest decline was between 2020 and 2021 when the population dropped 1.6%. Between 2010 and 2022, the county shrank by an average of 0.1% per year.

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  8. Cook County is an urban county in the upper northeastern section of the State of Illinois that contains more than 800 local governmental units within its boundaries. With a population of approximately 5.2 million people, it is the second most populous county in the nation and the 19th largest government in the United States (2015 census ...

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