Below is a list of Fairfax SD zip codes. For your research we have also included Fairfax Area Code, Time Zone, UTC and the local Gregory County FIPS Code. Each Fairfax South Dakota zip code has a center Longitude / Latitude point (the Fairfax center is -98.888397216797 / 43.028499603271). For your convenience we have also indicated if that zip code in Fairfax observes Daylight Savings time.