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McDonough County is a county located in the state of Illinois. According to the 2010 census, it had a
population of 32,612. McDonough County was
created on January 25, 1826. The county
seat is Macomb. The county is named
for Commodore Thomas McDonough (1783-1825), commander of American naval
forces at the Battle of Plattsburgh.
The Macomb, IL Micropolitan Statistical Area includes all of McDonough County.
The county is named for Commodore Thomas McDonough, defeated the British on Lake Champlain in 1814.
County QuickFacts: CensusBureau Quick Facts
McDonough County was created on January 25, 1826 (Laws, 1826, p. 76) and was formed from Schuyler County. County
organization was completed on June 14, 1830. Present area, or parts of it, formerly included in: Attached to Schuyler
County [Laws, 1826, p. 76] (1826-1830), Schuyler County (1825-1826), Pike County (1821-1825), Madison County (1812-1821)
and St. Clair County (1795-1812).
The County was named for Thomas McDonough, a Commodore of the United States Navy, who commanded the fleet on Lake Champlain in a successful engagement with the British fleet, near Plattsburg in 1814. The County Seat is Macomb (1831-Present).
As reported by the Census Bureau, the county has a total area of 590 square miles (1,528 km2), of which, 589 square miles (1,526 km2) of it is land and 1 square miles (2 km2) of it (0.13%) is water.
McDonough county is located in west Illinois. Argyle Lake State
Park is located in this county.
Bordering counties are as follows: