ZIP CodesZIP codes in Clark County, Illinois
Clark County, Illinois has 6 ZIP codes in this list, from 62420 to 62477. They cover 6 places, among them Casey, Dennison, Marshall and Martinsville.
| ZIP code | Place | Land area (sq mi) | Map point |
|---|---|---|---|
| 62420 | Casey | 123 | 39.302, -87.991 |
| 62423 | Dennison | 24.4 | 39.449, -87.587 |
| 62441 | Marshall | 177 | 39.422, -87.692 |
| 62442 | Martinsville | 140 | 39.317, -87.871 |
| 62474 | Westfield | 36.1 | 39.456, -87.996 |
| 62477 | West Union | 59.7 | 39.240, -87.651 |
The ZIP code areas of Clark County add up to about 560 square miles of land (1,450 sq km) as the Census Bureau draws them. The largest is 62441 (Marshall), with 177 square miles.
Using these codes
- In an address, the ZIP code comes last, after the city and the two-letter state: Casey, IL 62420.
- Tap a ZIP code to open it in the look-up, with a copy button for the address line.
- A code can cross a county line, and one town can have several codes. The table shows the main place of each code.
- "No area" means the Census Bureau draws no area for that code. Such codes are usually for post office boxes or a single building.
Places and counties: GeoNames. Areas: U.S. Census Bureau, 2024 ZIP Code Tabulation Areas. Checked in November 2026. This site is not connected with the United States Postal Service; for mailing, confirm the address with USPS.