|McDonough County Illinois Cities/Towns - Adair, Bardolph, Blandinsville, Bushnell, Colchester, Good Hope, Industry, Macomb (County Seat), Prairie City, Sciota, Tennessee
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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.
McDonough County is named in honor of Thomas Macdonough who defeated a British squadron in the decisive naval Battle of Lake Champlain in the War of 1812. McDonough County was part of the "Military Tract" set aside by Congress for veterans of the War of 1812.