Below is a list of Cos Cob CT zip codes. For your research we have also included Cos Cob Area Code, Time Zone, UTC and the local Fairfield County FIPS Code. Each Cos Cob Connecticut zip code has a center Longitude / Latitude point (the Cos Cob center is -73.600997924805 / 41.03099822998). For your convenience we have also indicated if that zip code in Cos Cob observes Daylight Savings time.