Fanning's Illustrated Gazetteer of the United States.... (New York: Phelps, Fanning & Co., 1853), 148.
HANCOCK COUNTY, situated on the western boundary of Illinois, with Mississippi river on the west. Area, 775 square miles. Face of the country even, consisting of prairie land; soil productive. Seat of justice, Carthage. Pop. in 1830, 483; in 1840, 9,946; in 1850, 14,652.