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Richland County is a county located in the state of Illinois. According to the 2010 census, it had a population of 16,233. Richland County was created on February 24, 1841. The county seat is Olney. The county is named for Richland County, Ohio, itself named for its rich soil.
The county is named for Richland County, Ohio, itself named for its rich soil.
County QuickFacts: CensusBureau Quick Facts
Richland County was created on February 24, 1841 (Laws, 1841, p. 77) and was formed from Clay and Lawrence Counties.
Present area, or parts of it, formerly included in: Lawrence County (1821-1841), Clay County (1824-1841), Wayne County
(1819-1824), Crawford County (1816-1824), Edwards County (1815-1819), Gallatin County (1812-1815), Madison County
(1812-1815), Randolph County (1803-1812), St. Clair County (1801-1809) and Knox, Northwest Territory (1790-1809).
The County was named for Richland County in Ohio through the influence of emigrants from that county. The County Seat is Olney (1841-Present).
As reported by the Census Bureau, the county has a total area of 362 square miles (938 km2), of which, 360 square miles (933 km2) of it is land and 2 square miles (5 km2) of it (0.52%) is water.
Richland county is located in southeast Illinois.
Bordering counties are as follows: