Waldo, a S. county of Maine, bounded E. by Penobscot river and bay, and drained by St. George and Marsh rivers and affluents of the Sebasticook; area, 812 sq. m.; pop. in 1870, 34,522. The surface is'undulating and the soil fertile. It has a large export trade, through Penobscot river and bay, in timber, lime, staves, etc. Cod and mackerel fishing is also carried on. The Maine Central railroad traverses it. The chief productions in 1870 were 1,943 bushels of wheat, 40,594 of Indian corn, 146,738 of oats, 78,791 of barley, 19,375 of peas and beans, 680,971 of potatoes, 876,494 lbs. of butter, 31,386 of cheese, 126,724 of wool, and 81,417 tons of hay. There were 5,116 horses, 8,861 milch cows, 14,511 other cattle, 31,343 sheep, and 3,064 swine. The whole number of manufactories was 374; capital invested, $705,110; value of products, $1,780,380. The chief establishments were 30 for the manufacture of carriages and wagons, 12 of clothing, 28 of cooperage, 4 of iron castings, 3 of fish oil, 1 of wrapping paper, 3 of sails, 2 of turned and carved wood, 5 flour mills, 9 tanneries, 3 currying establishments, 20 saw mills, 8 ship yards, and 6 wool-carding and cloth-dressing establishments.

Capital, Belfast.