Fanning's Illustrated Gazetteer of the United States.... (New York: Phelps, Fanning & Co., 1853), 54.
BROWN COUNTY, in the western part of Illinois, with Illinois river on the east, and Crooked river on the northeast. Area, 300 square miles. Seat of justice, Mount Sterling. Pop. in 1840, 4,183; in 1850, 7,198.