QUINCY, a town of Massachusetts, in the United States of North America, near the shore of a bay of the same name in Boston harbour, 8 miles S. by E. of Boston. It is well built on level ground, and has a stone church, a handsome granite town-house, a newspaper office, and two banks. It is chiefly remarkable for its granite quarries, in which about 1000 workmen are employed, and from which granite is sent to various parts of the country. Pop. (1850) 5017.