Below is a list of Custer MT zip codes. For your research we have also included Custer Area Code, Time Zone, UTC and the local Yellowstone County FIPS Code. Each Custer Montana zip code has a center Longitude / Latitude point (the Custer center is -107.55400085449 / 46.130500793457). For your convenience we have also indicated if that zip code in Custer observes Daylight Savings time.