Zip Area Code

North Sioux City, South Dakota

North Sioux City, South Dakota, in Union County, has ZIP code 57049 and area code 605.

ZIP code
57049
Area code
605
Coordinates
42.5249, -96.5074

ZIP codes in North Sioux City

ZIP codePost officeCountyArea codes
57049North Sioux CityUnion County605

Area code for North Sioux City

  • Area code 605

    In service since 1947. Local calls are dialed with ten digits; dialing 1 plus ten digits also works.

Towns near North Sioux City