Below is a list of Saint Xavier MT zip codes. For your research we have also included Saint Xavier Area Code, Time Zone, UTC and the local Big Horn County FIPS Code. Each Saint Xavier Montana zip code has a center Longitude / Latitude point (the Saint Xavier center is -107.7259979248 / 45.461101531982). For your convenience we have also indicated if that zip code in Saint Xavier observes Daylight Savings time.