Below is a list of Smithwick SD zip codes. For your research we have also included Smithwick Area Code, Time Zone, UTC and the local Fall River County FIPS Code. Each Smithwick South Dakota zip code has a center Longitude / Latitude point (the Smithwick center is -103.21800231934 / 43.30350112915). For your convenience we have also indicated if that zip code in Smithwick observes Daylight Savings time.