) Eastern ( UTC-4 ) ZIP code 02657 Area code(s) 508 / 774 FIPS code 25-55500 GNIS feature ID 0618258 Website: http://www.provincetowngov.org/ Provincetown is a town located at the extreme tip of Cape Cod in Barnstable County , Massachusetts , United States . The population was 3,431 at the 2000 census.