McDonough County, Illinois

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McDonough County is a county located in the U.S. state of Illinois. As of 2000, the population was 32,913. Its county seat is Macomb, Illinois[1].

The Macomb Micropolitan Statistical Area includes all of McDonough County.



According to the U.S. Census Bureau, the county has a total area of 590 square miles (1,528 km²), of which 589 square miles (1,526 km²) is land and 1 square mile (2 km²) (0.13%) is water.

The county has the unusual distinction of forming a perfect square by Mercator map projection. The county seat, Macomb, is in the center of the county, and the courthouse is almost precisely in the center of the county.

Major highways


Bethel, Blandinsville, Bushnell, Chalmers, Colchester, Emmet, Hire, Industry, Lamoine, Macomb, Macomb City, Mound, New Salem, Prairie City, Sciota, Scotland, Tennessee, Walnut Grove

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