Below is a list of Chelmsford MA zip codes. For your research we have also included Chelmsford Area Code, Time Zone, UTC and the local Middlesex County FIPS Code. Each Chelmsford Massachusetts zip code has a center Longitude / Latitude point (the Chelmsford center is -71.360801696777 / 42.600898742676). For your convenience we have also indicated if that zip code in Chelmsford observes Daylight Savings time.