SHELBY COUNTY, situated in the west part of Ohio, and traversed by Miami river. Area, 418 square miles. Face of the country, even; soil, fertile. Seat of justice, Sidney. Pop. in 1820, 2,106; in 1830, 3,671; in 1840, 12,154; in 1850, 13,958.

SENECA COUNTY, situated in the north part of Ohio, and traversed by Sandusky river. Area, 540 square miles. Soil, productive. Seat of justice, Tiffin. Pop. in 1830, 5,159; in 1840, 18,128; in 1850, 37,105.

SCIOTO COUNTY, situated on the southerly boundary of Ohio, with Ohio river on the south, and traversed by the Scioto. Area, 600 square miles. Face of the country, broken; soil, of middling quality. Seat of justice, Portsmouth. Pop. in 1810, 3,399; in 1820, 5,749; in 1830, 8,740; in 1840, 11,192; in 1850, 18,438.

SANDUSKY COUNTY, situated in the north part of Ohio, with Sandusky bay on the northeast, and traversed by Sandusky river. Area, 320 square miles. Face of the country low and level. Seat of justice, Fremont. Pop. in 1820, 852; in 1830, 2,851; in 1840, 10,182; in 1850, 14,305.

ROSS COUNTY, situated toward the south part of Ohio and traversed by Scioto river. Area, 650 square miles. Face of the country, diversified with meadow and uplands; soil fertile. Seat of justice, Chillicothe. Pop. in 1810, 15,514; in 1820, 20,619; in 1830, 24,068; in 1840, 27,460; in 1850, 32,071.

RICHLAND COUNTY, situated toward the north part of Ohio. Area, 900 square miles. Face of the country, even; soil fertile. Seat of justice, Mansfield. Pop. in 1820, 9,169; in 1830, 24,007; in 1840, 44,532; in 1850, 30,879.

PUTNAM COUNTY, situated in the northwest part of Ohio, and traversed by Auglaize river. Area, 376 square miles. Face of the country, even; soil productive where not marshy. Seat of justice, Kalida. Pop. in 1830, 230; in 1840, 5,189; in 1850, 7,221.

PREBLE COUNTY, situated on the west boundary of Ohio. Area, 432 square miles. Face of the country, even or gently undulating; soil, productive. Seat of justice, Eaton. Pop. in 1810, 3,304; in 1820, 10,237; in 1830, 16,291; in 1840, 19,482; in 1850, 21,736.

PORTAGE COUNTY, situated in the northeasterly part of Ohio, and traversed by Cuyahoga and Tuscarawaa rivers, which are separated by a portage of one mile. Area, 500 square miles. Face of the country, elevated and broken. Seat of justice, Ravenna. Pop. in 1810, 2,995; in 1820, 10,095; in 1830, 18,827; in 1840, 22,965; in 1850, 24,419.

PIKE COUNTY, situated in the south part of Ohio, and traversed by Scioto river. Area, 421 square miles. Face of the country, rough and hilly; soil varied but mostly of middling quality. Seat of justice, Piketon. Pop. in 1820, 4,253; in 1830, 6,024; in 1840, 7,626; in 1850, 10,953.