Fanning's Illustrated Gazetterr of the United States... (New York: Phelps, Fanning & Co., 1853), 391.
WILL COUNTY, situated on the east boundary of Illinois, and traversed by Des Plaines river. Area, 504 square miles. Face of the country even; soil, generally fertile. Seat of justice, Joliet. Pop. in 1840, 10,167; in 1850, 16,703.