Below is a list of Charlestown MA zip codes. For your research we have also included Charlestown Area Code, Time Zone, UTC and the local Suffolk County FIPS Code. Each Charlestown Massachusetts zip code has a center Longitude / Latitude point (the Charlestown center is -71.063102722168 / 42.379199981689). For your convenience we have also indicated if that zip code in Charlestown observes Daylight Savings time.