Cooper, a central county of Missouri, bounded N. by Missouri river, and intersected by the Lamine, which is navigable from its mouth to the Blackwater; area, 558 sq. m.; pop. in 1870, 20,692, of whom 3,352 were colored. The surface is hilly or moderately undulating, and occupied in some places by prairies. The soil requires little labor for cultivation, and the mineral wealth is said to be inexhaustible. Mines of bituminous and cannel coal are worked with profit in various quarters; iron and lead ores are extracted from veins near the Lamine; there are several quarries of marble and hydraulic limestone; and from the vicinity of Moniteau creek is obtained a kind of sand used in the manufacture of flint glass, and especially valuable on account of its rarity. The Pacific railroad of Missouri crosses the S. W. corner, and the Booneville branch traverses the county. The chief productions in 1870 were 385,-696 bushels of wheat, 1,210,533 of Indian corn, 412,809 of oats, 68,052 of potatoes, 11,579 tons of hay, 227,001 lbs. of butter, 78,571 of wool, and 34,731 of tobacco.

There were 6,971 horses, 2,607 mules and asses, 5,383 milch cows, 9,628 other cattle, 21,208 sheep, and 43,813 swine; 5 grist mills, 6 saw mills, 9 manufactories of carriages and wagons, 3 of bricks, 3 of stone and earthen ware, 1 of tobacco and snyff, 1 leather-currying, and 3 wool-carding and cloth-dressing establishments. Capital, Booneville.