Fanning's Illustrated Gazetteer of the United States.... (New York: Phelps, Fanning & Co., 1853), 82.
CLARK COUNTY, situated toward the southwest part of Ohio. Area, 412 square miles. Face of the country beautifully undulating; soil exceedingly fertile. Seat of justice, Springfield. Pop. in 1830, 13,114; in 1840, 16,882; in 1850, 22,178.