BELMONT, a residential town of Middlesex county, Massa chusetts, U.S.A., on the Boston and Maine Railroad, 6m. W. by N. of Boston, adjoining Cambridge. It was formed from parts of Watertown, Waltham and West Cambridge, and was incorporated in 1859 after a bitter contest through several successive legisla tures. Its area is 4.8sq.m. The population in 186o was 1,198; in 1920 it was 50,749; and in 1930, according to the Federal census, 25,748. The principal villages are Belmont and Waverly. The Massachusetts general hospital in 1876 established its convales cent home on a tract of 114ac. known as Waverly Highlands; and in 1895 the McLean hospital moved to Waverly from Somerville.