Below is a list of Oakley CA zip codes. For your research we have also included Oakley Area Code, Time Zone, UTC and the local Contra Costa County FIPS Code. Each Oakley California zip code has a center Longitude / Latitude point (the Oakley center is -121.71399688721 / 37.98929977417). For your convenience we have also indicated if that zip code in Oakley observes Daylight Savings time.