Greene County, Illinois
Lat/Long: 39.3500, -90.4000
The Illinois legislature created Greene County in 1821 from Madison County. Later that year, commissioners appointed for the purpose chose a site for the county seat and established the town of Carrollton there.
"An Act Establishing the County of Greene," 20 January 1821, Laws of Illinois (1821), 26-28; History of Greene County, Illinois (Chicago: Donnelley, Gassette & Loyd, 1879), 252-53.