DARKE COUNTY, situated on the west boundary of Ohio. Area, 714 square miles. Face of the country diversified, but generally level; soil productive. Seat of justice, Greenville. Pop. in 1820, 3,717; in 1830, 6,203; in 1840, 13,282; in 1850, 20,274.

CRAWFORD COUNTY, situated toward the north part of Ohio, and drained by Sandusky river. Area, 590 square miles. Face of the country generally flat, containing several large prairies or swamps. Seat of justice, Bucyrus. Pop. in 1830, 4,791; in 1840, 13,152; 1850, 18,177.

COSHOCTON COUNTY, situated near the central part of Ohio. Area, 562 square miles. Face of the county diversified and hilly; soil in the valleys highly fertile. Seat of justice, Coshocton. Pop. in 1820, 7,086; in 1830, 11,161; in 1840, 21,590; in 1850, 25,674.

COLUMBIANA COUNTY, situated on the east boundary of Ohio, with Ohio river on the southeast. Area, 750 square miles. Face of the country generally rolling and hilly, except along the streams where it is level and the soil is highly productive. Seat of justice, New Lisbon. Pop. in 1820, 22,033; in 1830, 35,508; in 1840, 40,378; in 1850, 33,621.

CLINTON COUNTY, situated toward the southwest comer of Ohio, and drained by tributaries of Little Miami river. Area, 400 square miles. Face of the country generally level, but sufficiently undulated for cultivating. The soil in general is rich and easily cultivated or reclaimed. Seat of justice, Wilmington. Pop. in 1820, 8,085; in 1830, 11,436; in 1840, 15,719; in 1850, 18,838.

CLERMONT COUNTY, situated on the south boundary of Ohio, on the north side of Ohio river. Area, 450 square miles. Much of the soil of this county is of an excellent quality. Seat of justice, Batavia. Pop. in 1820, 15,820; in 1830, 20,466; in 1840, 23,106; in 1850, 30,455.

CHAMPAIGN COUNTY, situated toward the westerly part of Ohio, and traversed by Mad river. Area, 450 square miles. Face of the country level, or gently undulating, with a soil exuberantly fertile. Seat of justice, Urbana. Pop. in 1820, 8,479; in 1830, 12,130; in 1840, 16,721; in 1850, 19,762.

CLARK COUNTY, situated toward the southwest part of Ohio. Area, 412 square miles. Face of the country beautifully undulating; soil exceedingly fertile. Seat of justice, Springfield. Pop. in 1830, 13,114; in 1840, 16,882; in 1850, 22,178.

CUYAHOGA COUNTY, situated on the north boundary of Ohio, on Lake Erie, and traversed by Cuyahoga river. Area, 475 square miles. Face of the country generally hilly; soil generally good. Seat of justice, Cleveland. Pop. in 1810, 1,495; in 1820, 6,328; in 1830, 10,361; in 1840, 26,506; in 1850, 48,099.

CARROLL COUNTY, situated in the eastern part of Ohio. Area, 400 square miles. Seat of justice, Carrollton. Pop, in 1840, 18,108; in 1850, 17,685.