MAHONING COUNTY, situated on the east boundary of Ohio. Area, ----- square miles. Seat of justice, Canfield. Pop. in 1850, 23,735.

MADISON COUNTY, situated In the central part of Ohio. Area, 400 square miles. Soil productive. Seat of justice, London. Pop. in 1810, 1,603; in 1820, 4,799; in 1830, 6,190; in 1840, 9,025; in 1850, 10,046.

LUCAS COUNTY, situated on the north boundary of Ohio, with Maumee river on the southeast. Area, 600 square miles. Seat of justice, Maumee City. Pop. in 1840, 9,382; in 1850, 12,263.

LOGAN COUNTY, situated toward the west part Ohio. Area, 425 square miles. Face of the country, level; soil generally productive. Seat of justice, Bellefontaine. Pop. in 1820, 3,181; in 1830, 6,442; in 1840, 14,015; in 1850, 19,162.

LICKING COUNTY, situated in the central part of Ohio. Area, 666 square miles. Face of the country pleasantly diversified with hills and valleys; soil rich. Seat of justice, Newark. Pop. in 1820, 11,861; in 1830, 20,868; in 1840, 35,096; in 1850, 38,852.

LAWRENCE COUNTY, situated on the southerly boundary of Ohio, with Ohio river on the south. Area, 430 square miles. Face of the country hilly; soil generally unproductive. Seat of justice, Burlington. Pop in 1820, 3,499; in 1830, 5,367; in 1840, 9,738; in 1850, 15,726.

LAKE COUNTY, situated on the north boundary of Ohio on Lake Erie. Area, 820 square miles Seat of justice, Painesville. Pop. in 1840, 13,719; in 1850, 14,650.

KNOX COUNTY, situated in the central part of Ohio. Area, 618 square miles. Face of the country generally level; soil productive. Seat of justice, Mount Vernon. Pop. in 1810, 2,149; in 1820, 8,326; in 1830, 17,124; in 1840, 29,579; in 1850, 28,773.

JEFFERSON COUNTY, situated on the easterly boundary of Ohio, on the Ohio river. Area, 396 square miles. Soil fertile. Seat of justice, Steubenville. Pop. in 1810 17,260; in 1820, 18,531; in 1830, 22,489; in 1840, 25,030; in 1850, 29,132.

JACKSON COUNTY, situated in the southerly part of Ohio. Area, 400 square miles. Face of the country uneven; soil productive. Seat of justice, Jackson. Pop. in 1820, 3,746; in 1830, 5,974; in 1840, 9,744; in 1850, 12,621.