Fanning's Illustrated Gazetteer of the United States.... (New York: Phelps, Fanning & Co., 1853), 127.
FOND DU LAC COUNTY, situated toward the easterly part of Wisconsin, with the southern part of Lake Winnebago on the north. Area, 400 square miles. Seat of justice, Fond du Lac. Pop. in 1840, 139; in 1850, 2,024.