Fanning's Illustrated Gazetteer of the United States.... (New York: Phelps, Fanning & Co., 1853), 85.
CLINTON COUNTY, situated toward the southwest comer of Ohio, and drained by tributaries of Little Miami river. Area, 400 square miles. Face of the country generally level, but sufficiently undulated for cultivating. The soil in general is rich and easily cultivated or reclaimed. Seat of justice, Wilmington. Pop. in 1820, 8,085; in 1830, 11,436; in 1840, 15,719; in 1850, 18,838.