PLYMOUTH, a seaport of the United States of North America, state of Massachusetts, on Plymouth Bay, 35 miles S.E. of Boston. It is built chiefly of wood, and entirely in modern style, there being not a single antique building to remind the visitor that this is the oldest town of New England. The Pilgrim's Hall is a plain massive granite building, erected in 1824 by the Pilgrim Society, who meet annually here to commemorate the arrival here of the 101 pilgrim fathers, as they are called, in the Mayflower, December 22, 1620. In the hall there are several historical paintings and a cabinet of curiosities; and in front of the building is placed a part of the rock on which the emigrants first set foot. Some of the churches are handsome; and one occupies the site of that originally built by the pilgrims. Plymouth contains county buildings, banks, newspaper offices, cotton factories, &c. The inhabitants are largely engaged in the fisheries. The total tonnage of the port, June 30, 1852, was 3368 registered, and 9365 enrolled and licensed; the latter including 2538 tons employed in the coasting trade, 5169 in cod-fishing, and 1495 in mackerel-fishing. Pop. (1850) 6024.