781 é um overlay para 617 cobrindo subúrbios interiores de Boston — não uma única "grande cidade".
Abington, Acton, Arlington, Ashland, Bedford, Bellingham, Belmont, Boxborough, Braintree, Brookline, Burlington, Cambridge (parte), Canton, Carlisle, Chelmsford, Cohasset, Concord, Dedham, Dover, Duxbury, Easton, Foxborough, Framingham, Franklin, Hanover, Hingham, Holbrook, Holliston, Hopkinton, Hudson, Hull, Lexington, Lincoln, Littleton, Lynn, Lynnfield, Malden, Marlborough, Marshfield, Medfield, Medford, Medway, Melrose, Millis, Milton, Nahant, Natick, Needham, Newton, Norfolk, Norwell, Norwood, Peabody, Quincy, Randolph, Reading, Revere, Rockland, Saugus, Scituate, Sharon, Sherborn, Somerville, Stoneham, Stoughton, Stow, Sudbury, Swampscott, Wakefield, Walpole, Waltham, Watertown, Wayland, Wellesley, Weston, Westwood, Weymouth, Wilmington, Winchester, Winthrop, Woburn, Wrentham.
Todas em Hora do Leste; overlay com 339 desde 2001.
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