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Johnson County is a county located in the state of Illinois. According to the 2010 census, it has a population of 12,582. Johnson County was created on September 14, 1812. The county seat is Vienna. The county is named for Richard Mentor Johnson, ninth Vice President of the United States and United States Senator from Kentucky.
The county is named for Richard M. Johnson, a congressman from Kentucky. Johnson served in the Army in the War of 1812.
He later went on to be Vice President of the United States for one term, under President Martin Van Buren. He died
in 1850, shortly after winning re-election to the US House of Representatives.
County QuickFacts: CensusBureau Quick Facts
Johnson County was created on September 14, 1812 (By proclamation, Territorial Record of Illinois, p. 26) and was
formed from Randolph County. Present area, or parts of it, formerly included in: Randolph County (1795-1812) and Knox,
Northwest Territory (1790-1801).
The County was named for Richard Mentor Johnson, a Colonel of the Kentucky militia, who served in Indian wars and the War of 1812, and reputed to have killed the Indian chief, Tecumseh, at the battle of Thames. Johnson served as Representative in Congress and United States Senator from Kentucky and Vice-President of the United States from 1837 to 1841. The County Seat is Vienna . Prior County Seats was Home of John Bradshaw (1813-1814), Elvira (1814-1818) and Vienna (1818-Present).
As reported by the Census Bureau, the county has a total area of 349 square miles (904 km2), of which, 345 square miles (893 km2) of it is land and 4 square miles (11 km2) of it (1.22%) is water.
Johnson county is located in south Illinois. Cache River State
Natural Area is located in this county and part of Cypress Creek
National Wildlife Refuge and Shawnee National Forest.
Bordering counties are as follows: