Winnebago County, Illinois (Fanning's, 1853)
Gazetteer/Almanac
WINNEGABO COUNTY, situated on the north boundary of Illinois, and traversed by Rock river. Area, 504 squared miles. Seat of justice, Rockford. Pop. in 1840, 4,609; in 1850, 11,773.
Fanning's Illustrated Gazetteer of the United States... (New York: Phelps, Fanning & Co., 1853), 394.