Rock Island County, Illinois (Fanning's, 1853)
Gazetteer/Almanac
Fanning's Illustrated Gazetteer of the United States... (New York: Phelps, Fanning & Co., 1853), 313.
ROCK ISLAND COUNTY, situated on the northwesterly boundary of Illinois, on the Mississippi, and traversed by Rock river. Area, square miles. Seat of justice, Rock Island. Pop. in 1850, 6,397.