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Marion County is a county located in the state of Illinois. According to the 2010 census, it had a
population of 39,437. Marion County was created
on January 24, 1823. The county seat is Salem.
The county is named for Francis Marion (1732-1795),
general in the American Revolutionary War known as "The Swamp Fox".
Marion County comprises the Centralia, IL Micropolitan Statistical Area, which is included in the St. Louis-St. Charles-Farmington, MO-IL Combined Statistical Area.
The county is named for General Francis Marion, known as the "Swamp Fox," distinguished soldier in the Carolinas during the American Revolution.
County QuickFacts: CensusBureau Quick Facts
Marion County was created on January 24, 1823 (Laws, 1823, p. 49) and was formed from Fayette and Jefferson Counties.
Present area, or parts of it, formerly included in: Jefferson County (1819-1823), Fayette County (1821-1823), Crawford
County (1816-1821), Edwards County (1815-1819), Gallatin County (1812-1815), Madison County (1812-1815), Randolph County
(1803-1813), St. Clair County (1790-1813) and Knox, Northwest Territory (1790-1801).
The County was named for Francis Marion, a soldier of the Revolution who distinguished himself as a partisan commander in the Carolinas. The County Seat is Salem (1823-Present).
As reported by the Census Bureau, the county has a total area of 576 square miles (1,491 km2), of which, 572
square miles (1,482 km2) of it is land and 3 square miles (9 km2) of it (0.60%) is water.
Marion county is located in south Illinois. The southwest corner of Marion County is the intersection of the Baseline with the Third Principal Meridian, the point of origin for the third survey of the Northwest Territory under the Land Ordinance of 1785. The origin is marked with a boulder south of Centralia just off US 51. Stephen A. Forbes State Recreation Area is located in this county.
Bordering counties are as follows: