Below is a list of Big Arm MT zip codes. For your research we have also included Big Arm Area Code, Time Zone, UTC and the local Lake County FIPS Code. Each Big Arm Montana zip code has a center Longitude / Latitude point (the Big Arm center is -114.29499816895 / 47.798099517822). For your convenience we have also indicated if that zip code in Big Arm observes Daylight Savings time.