Below is a list of Old Saybrook CT zip codes. For your research we have also included Old Saybrook Area Code, Time Zone, UTC and the local Middlesex County FIPS Code. Each Old Saybrook Connecticut zip code has a center Longitude / Latitude point (the Old Saybrook center is -72.382202148438 / 41.298099517822). For your convenience we have also indicated if that zip code in Old Saybrook observes Daylight Savings time.