Below is a list of Oneco CT zip codes. For your research we have also included Oneco Area Code, Time Zone, UTC and the local Windham County FIPS Code. Each Oneco Connecticut zip code has a center Longitude / Latitude point (the Oneco center is -71.80899810791 / 41.693599700928). For your convenience we have also indicated if that zip code in Oneco observes Daylight Savings time.