Created as a territory in the western United States on March 2, 1861. Capital at Genoa in 1861, moved to Carson City in 1861. Admitted to statehood on October 31, 1864.
County in west central Illinois. Seat at Jacksonville, Illinois. Established January 31, 1823. Population of 22,112 (21,937 white residents and 175 free African American residents) in 1860.