Fanning's Illustrated Gazetteer of the United States.... (New York: Phelps, Fanning & Co., 1853), 217.
MERCER COUNTY, situated on the west boundary of Ohio. Area, 576 square miles. Face of the country, level; soil, productive where not marshy. Seat of justice Cetina. Pop. in 1830, 1,110; in 1840, 6,277; in 1850, 7,712.