Charlestown, MA is a city located in Suffolk County, Massachusetts and has a land area of 1.35 square miles (3.50 km2). The water area for the city is 0.49 square miles or 1.27 km2. There is one unique zip code in Charlestown, Massachusetts and it is 02129. The area code(s) for Charlestown is 617/857/781/339.
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