Illinois Gazetteer > Illinois ZIP Codes > County ZIP Codes > Clark ZIP Codes

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

ZIP Codes in Clark County with Associated Cities & Towns

Casey   62420
Dennison   62423
 Marshall   62441
Martinsville   62442
 West Union   62477
Westfield   62474

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.