CLEARFIELD COUNTY, situated toward the westerly part of Pennsylvania, and traversed by the west branch of Susquehanna river. Area, 1,425 square miles. Although much of the soil of this county is excellent, it is truly an Alpine region, rich in the most varied scenery, the surface being generally broken, and much of it mountainous. It is well watered, and has a salubrious climate. Seat of justice, Clearfield. Pop. in 1820, 2,342; in 1830, 4,803; in 1840. 7,834; in 1850, 12,586.

CLARION COUNTY, situated toward the northwest part of Pennsylvania, on the northeast side of Alleghany river, and traversed by Clarion river. Area, 530 square miles. Seat of justice, Clarion. Pop. in 185O, 23,565.

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.

CENTRE COUNTY, situated in the central part of Pennsylvania, with the west branch of Susquehanna river on the northwest. Area, 1,560 square miles. Face of the country, mountainous and hilly; soil generally rocky and sterile, but much good land along the streams. Seat of justice, Bellefonte. Pop. in 1820, 13 786; in 1830, 16,765; in 1840, 20,492; in 1850, 23,355.

CARBON COUNTY, situated in the eastern part of Pennsylvania, and traversed by Lehigh river. Area, -- square miles. Seat of justice, Mauch Chunk. Pop. in 1850, 15,686.

CAMBRIA COUNTY, situated in the central part of Pennsylvania, and drained by Connemaugh river. Area, 720 square miles. Face of the country hilly and rocky, soil generally of fair quality. Seat of justice, Ebesnburgh. Pop. in 1820, 3,287; in 1830, 7,079; in 1840, 11,250; in 1850, 17,773.

WOODFORD COUNTY, situated in the central part of Illinois, with Illinois river on the northwest.  Area, 470 squared miles.  Seat of justice, Woodford.  Pop. in 1850, 4,416.

WINNEGABO COUNTY, situated on the north boundary of Illinois, and traversed by Rock river.  Area, 504 squared miles.  Seat of justice, Rockford.  Pop. in 1840, 4,609; in 1850, 11,773.

WILLIAMSON COUNTY, situated in the south part of Illinois. Area, 432 square miles. Seat of justice, Marion. Pop. in 1840, 4,457; in 1850, 7,216.