Below is a list of Amherst SD zip codes. For your research we have also included Amherst Area Code, Time Zone, UTC and the local Marshall County FIPS Code. Each Amherst South Dakota zip code has a center Longitude / Latitude point (the Amherst center is -97.921096801758 / 45.737800598145). For your convenience we have also indicated if that zip code in Amherst observes Daylight Savings time.