NELSON COUNTY, situated toward the north part of Kentucky. Area, 460 square miles. Soil productive. Seat of justice, Bardstown. Pop. in 1810, 14,078; in 1820, 16,273; in 1830, 14,916; in 1840, 13,637; in 1850, 14,789.

MUHLENBURGH COUNTY, situated in the westerly part of Kentucky, with Green river on the northeast. Area, 490 square miles. Seat of justice, Greenville. Pop. in 1820, 4,979; in 1830, 5,341; in 1840, 6,964; in 1850, 9,809.

MORGAN COUNTY, situated in the easterly part of Kentucky, and traversed by Licking river. Area, 890 square miles. Seat of justice, West Liberty. Pop. in 1840, 4,603; in 1850, 7,620.

MONTGOMERY COUNTY, situated toward the northeast part of Kentucky. Area, 260 square miles. Face of the country uneven; soil productive. Seat of justice, Mount Sterling. Pop. in 1810, 12,975; in 1820, 9,587; in 1830, 10,221; in 1840, 9,332; in 1850, 9,903.

MONROE COUNTY, situated on the south boundary of Kentucky, and traversed by Cumberland river. Area, 375 square miles. Seat of justice, Tompkinsville. Pop. in 1820, 4,956; in 1830, 5,340; in 1840, 6,526; in 1850, 7,756.

MERCER COUNTY, situated in the central part of Kentucky, with Kentucky river on the northeast. Area, 350 square miles. Seat of justice, Harrisburgh. Pop. in 1810, 12,430; in 1820, 15,587; in 1830, 17,706; in 1840, 18,720; in 1850, 17,067.

MEAD COUNTY, situated on the northerly boundary of Kentucky, with Ohio river on the north. Area, 360 square miles. Seat of justice, Brandenburgh. Pop. in 1840, 5,780; in 1850, 7,393.

McLEAN COUNTY, situated in the central part of Illinois. Area, 1,296 square miles. Seat of justice, Bloomington. Pop. in 1840, 6,565; in 1850, 10,163.

McCRACKEN COUNTY, situated on the northwesterly boundary of Kentucky, with Ohio river on the north, and the Tennessee river on the northeast. Area, 200 square miles. Seat of justice, Paducah. Pop. in 1830 1,297; in 1840, 4,745; in 1850, 6,067.