DOVER, a town in the state of New Hampshire, North America, and capital of the county of Strafford, is situated on the W. side of Piscataqua river, and watered by its tributaries the Coheco and the Black river; 60 miles N. of Boston. The Coheco has here a sudden descent of 32½ feet, producing a great water-power, and being at the head of tide-water and 12 miles from the sea, sloops can come up to within a short distance of the mills. It has numerous and extensive manufactures, chiefly of cotton goods; a considerable shipping; and is one of the most flourishing towns in the state. Dover is the oldest town in this state, having been settled in 1623. Pop. (1850) 8186.