Below is a list of Contra Costa County CA zip codes. For your research we have also included Contra Costa County Area Code, Time Zone, UTC and the local County FIPS Code. Each Contra Costa County California zip code has a center Longitude / Latitude point (the Contra Costa County center is -122.06700134277 / 37.934200286865). For your convenience we have also indicated if that zip code in Contra Costa County observes Daylight Savings time.