Below is a list of Middlefield CT zip codes. For your research we have also included Middlefield Area Code, Time Zone, UTC and the local Middlesex County FIPS Code. Each Middlefield Connecticut zip code has a center Longitude / Latitude point (the Middlefield center is -72.712303161621 / 41.515998840332). For your convenience we have also indicated if that zip code in Middlefield observes Daylight Savings time.