Fanning's Illustrated Gazetteer of the United States.... (New York: Phelps, Fanning & Co., 1853), 151.
HART COUNTY, situated near the central part of Kentucky, and traversed by Green river. Area, 432 square miles. Face of the country level; soil unproductive, chiefly consisting of barrens. Seat of justice, Mumfordsville. Pop. in 1820, 4,184; in 1830, 5,191; in 1840, 7,031; in 1850, 9,093.