US Gazetteer > Wisconsin Gazetteer > Wisconsin ZIP Codes > County ZIP Codes > Jefferson ZIP Codes

ZIP Codes in Jefferson County with Associated Cities & Towns

Fort Atkinson   53538
Helenville   53137
Ixonia   53036
Jefferson   53549
 Johnson Creek   53038
Johnson Creek   53094
Lake Mills   53551
Palmyra   53156
 Sullivan   53178
Waterloo   53594
Watertown   53094

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.