Clark County, Illinois ZIP Codes

7 ZIP Codes

Zip Code
City
Population ↓
62441Marshall7,003
62420Casey4,299
62442Martinsville2,671
62474Westfield626
62423Dennison546
62477West Union526
62478West York333

Overview of ZIP Codes in Clark County

ZCTAs are geographic areas created by the US Census Bureau to approximate the delivery areas of ZIP Codes for statistical analysis. While ZCTAs use the same five-digit codes as ZIP Codes, they represent defined geographic areas that may not exactly match the mail delivery routes of ZIP Codes.
7
ZIP Codes

The data shown reflect ZCTAs from the US Census. As of 2025, there are 7 ZCTAs in Clark County, Illinois (US Census).

Sources

  1. US Census: 2025 Gazetteer Files
  2. US Census: ZIP Code Tabulation Areas (ZCTAs)

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