Below is a list of Granite County MT zip codes. For your research we have also included Granite County Area Code, Time Zone, UTC and the local County FIPS Code. Each Granite County Montana zip code has a center Longitude / Latitude point (the Granite County center is -113.26899719238 / 46.452499389648). For your convenience we have also indicated if that zip code in Granite County observes Daylight Savings time.