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  2. Geography of Illinois - Wikipedia

    en.wikipedia.org/wiki/Geography_of_Illinois

    The Illinois side includes Henry County, Mercer County, and Rock Island County. [4] In extreme northwestern Illinois the Driftless Zone, a region of unglaciated and therefore higher and more rugged topography, occupies a small part of the state. Charles Mound, located in this region, is the state's highest elevation above sea level.

  3. List of counties in Illinois - Wikipedia

    en.wikipedia.org/wiki/List_of_counties_in_Illinois

    The last county, Ford County, was created by the Illinois government 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.

  4. Illinois - Wikipedia

    en.wikipedia.org/wiki/Illinois

    The property tax in Illinois is imposed only on real property. [25] [28] [67] On May 1, 2019, the Illinois Senate voted to approve a constitutional amendment that would have stricken language from the Illinois Constitution requiring a flat state income tax, in a 73–44 vote. If approved, the amendment would have allowed the state legislature ...

  5. List of protected areas of Illinois - Wikipedia

    en.wikipedia.org/wiki/List_of_protected_areas_of...

    One of the largest systems is the Forest Preserve District of Cook County, which includes Brookfield Zoo and the Chicago Botanic Garden as well as 70,000 acres (280 km 2) of open land, or 11.6 percent of Cook County's land area. Under Illinois law, counties may set up a conservation land holding district, after approval by county voters.

  6. List of principal and guide meridians and base lines of the ...

    en.wikipedia.org/wiki/List_of_principal_and...

    Figure 1. This BLM map depicts the principal meridians and baselines used for surveying states (colored) in the PLSS.. The following are the principal and guide meridians and base lines of the United States, with the year established and a brief summary of what areas' land surveys are based on each.

  7. Category:Landforms of Illinois - Wikipedia

    en.wikipedia.org/wiki/Category:Landforms_of_Illinois

    This page was last edited on 15 February 2025, at 14:41 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.