US Gazetteer > Illinois Gazetteer > Illinois ZIP Codes > County ZIP Codes > Whiteside ZIP Codes

ZIP Codes in Whiteside County with Associated Cities & Towns

Albany   61230
Coleta   61081
Deer Grove   61243
Erie   61250
Fenton   61251
 Fulton   61252
Galt   61037
Lyndon   61261
Morrison   61270
 Prophetstown   61277
Rock Falls   61071
Sterling   61081
Tampico   61283

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.