South Dakota Gazetteer > South Dakota ZIP Codes > County ZIP Codes > Union ZIP Codes

Also see: ZIP Codes in Union with Associated Cities & Towns

ZIP Codes in Union County with Associated Cities & Towns

Alcester   57001
Beresford   57004
Dakota Dunes   57049
 Elk Point   57025
Jefferson   57038
McCook Lake   57049
 N Sioux City   57049
North Sioux City   57049

ZIP Codes - Key Concepts

  1. ZIP Codes are categories for grouping mailing addresses and are not exact geographic regions.
  2. The centroid of a ZIP Code may be in one County and the associated city/town in another.
  3. In rural areas, a single ZIP Code may be used for cities and towns in several different Counties.
  4. ZIP Code "areas" can overlap, be subsets of each other, or be artificial constructs with no geographic area.
  5. ZIP Codes are only loosely tied to cities.