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Edgar County was formed out of Clark County in 1823. It was named for John Edgar, an Irish-born officer in the Royal Navy who resigned rather than fight against the Americans in the Revolutionary War. Edgar moved to Kaskaskia, Illinois, in 1784, becoming a miller and merchant in that town.
File:Edgar County Illinois 1823.png
Edgar County (1823), with unorganized territory attached to it. |
File:Edgar County Illinois 1825.png
Edgar County (1825–1826) |
File:Edgar County Illinois 1826.png
Edgar County (1826–1830) |
File:Edgar County Illinois 1830.png
Edgar County (1830–present), with the additional territory incorporated into Coles County |
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