Fanning's Illustrated Gazetteer of the United States.... (New York: Phelps, Fanning & Co., 1853), 77.
CHESTER COUNTY, situated at the southeast corner of Pennsylvania, with Schuylkill river on the northeast. Area, 729 square miles. Face of the country extremely diversified by mountains, hills, valleys and plains, with a soil equally varied, changing from rocky to the productive limestone valley, and the fertile loamy plain. Seat of justice, Westchester. Pop. in 1820, 44,455; in 1830, 50,910; in 1840. 57,515; in 1850, 66,438.