Mercer County, Missouri (Fanning's, 1853)
Gazetteer/Almanac
      
            MERCER COUNTY, situated on the north boundary of Missouri. Area, ----------- square miles. Seat of justice, Princeton. Pop. in 1850, 2,691.
      
            Fanning's Illustrated Gazetteer of the United States....  (New York: Phelps, Fanning & Co., 1853), 217.