Below is a list of Gem KS zip codes. For your research we have also included Gem Area Code, Time Zone, UTC and the local Thomas County FIPS Code. Each Gem Kansas zip code has a center Longitude / Latitude point (the Gem center is -100.89800262451 / 39.426200866699). For your convenience we have also indicated if that zip code in Gem observes Daylight Savings time.