Rock County, Wisconsin (Fanning's, 1853)
Gazetteer/Almanac
ROCK COUNTY, situated on the south boundary of Wisconsin, and traversed by Rock river. Area, -------- square miles. Face of the country, even; soil, rich. Seat of justice, Janesville. Pop. in 1840, 1,701; in 1850, 20,708.
Fanning's Illustrated Gazetteer of the United States.... (New York: Phelps, Fanning & Co., 1853), 313.