Below is a list of Big Sandy MT zip codes. For your research we have also included Big Sandy Area Code, Time Zone, UTC and the local Chouteau County FIPS Code. Each Big Sandy Montana zip code has a center Longitude / Latitude point (the Big Sandy center is -110.11199951172 / 48.178699493408). For your convenience we have also indicated if that zip code in Big Sandy observes Daylight Savings time.