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 Passed by the Second General Assembly of the State of Illinois (1821), 26-28; History of Greene County, Illinois (Chicago: Donnelley, Gassette & Loyd, 1879), 252-53.