Fanning's Illustrated Gazetteer of the United States.... (New York: Phelps, Fanning & Co., 1853), 175.
JO-DAVIESS COUNTY, situated at the northwest corner of Illinois, on the Mississippi river. Area, 724 square miles. Soil rich. Seat of justice, Galena. Pop. in 1830, 2,111; in 1840, 6,180; in 1850, 18,604.