Below is a list of Fallon County MT zip codes. For your research we have also included Fallon County Area Code, Time Zone, UTC and the local County FIPS Code. Each Fallon County Montana zip code has a center Longitude / Latitude point (the Fallon County center is -104.45800018311 / 46.2952003479). For your convenience we have also indicated if that zip code in Fallon County observes Daylight Savings time.