Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Belmont is a town in Middlesex County, Massachusetts, a suburb of Boston. The population was 24,729 at the 2010 census. Belmont was founded on March 18, 1859 by former citizens of, and land from the bordering towns of Watertown, to the south; Waltham, to the west; and Arlington, then known as West Cambridge, to the north. The town was named after Bellmont, the 200 acre estate of one of the leading advocates of and largest donor to its creation, John Perkins Cushing.