PLATTE COUNTY, situated on the westerly boundary of Missouri, with Missouri river on the southwest. Area, --------- square miles. Seat of justice, Platte city. Pop. in 1850, 16,845.

PIKE COUNTY, situated on the northeasterly boundary of Missouri, with Mississippi river on the northeast. Area, 720 square miles. Seat of justice, Bowling Green. Pop. in 1820, 3,747; in 1830, 6,122; in 1840, 10,646; in 1850, 13,609.

PETTIS COUNTY, situated toward the west part of Missouri. Area, 600 square miles. Seat of justice, Georgetown. Pop. in 1840, 2,930; in 1850, 5,150.

OZARK COUNTY, situated on the south boundary of Missouri. Area, -------- square miles. Seat of justice, Rockbridge. Pop. in 1850, 2,294.

OSAGE COUNTY, situated in the central part of Missouri, with Missouri and Osage rivers on the northwest, and traversed by the Gasconade river. Area, --------- square miles. Seat of justice, Linn. Pop. in 1850, 6,704.

OREGON COUNTY, situated on the south boundary of Missouri. Area, -------- square miles. Seat of justice, Thomasville. Pop. in 1850, 1,432.

NODAWAY COUNTY, situated on the north boundary of Missouri. Area, ------ square miles. Seat of justice, Marysville. Pop. in 1850, 2,118.

NEWTON COUNTY, situated on the west boundary of Missouri. Area (in 1840), 1,150 square miles. Seat of justice, Neosho. Pop. in 1840, 3,790; in 1850, 4,268.

MORGAN COUNTY, situated in the central part of Missouri, with Osage river on the south. Area, 792 square miles. Seat of justice, Versailles. Pop. in 1840, 4,407; in 1850, 4,650.

MONTGOMERY COUNTY, situated in the easterly part of Missouri, with Missouri river on the south. Area, 576 square miles. Seat of justice, Danville. Pop. in 1820, 3,074; in 1830, 3,902; in 1840, 4,371; in 1850, 5,849.