County · Illinois · United States
Clark County ZIP codes
6 ZIP codes · 6 cities · FIPS 17023
Key facts
- State
- Illinois (IL)
- FIPS code
- 17023
- Population
- 15,328
- Median household income
- $70,625
- Median age
- 42
- Land area
- 501.4 sq mi (1,298.6 km²)
- Population density
- 31 / sq mi
- Area codes
- 217, 447
Cities and ZIP codes in Clark County (6)
| City | ZIP codes |
|---|---|
| Casey | 62420 |
| Dennison | 62423 |
| Marshall | 62441 |
| Martinsville | 62442 |
| West Union | 62477 |
| Westfield | 62474 |
About this page
County figures are Census county-level values (ACS 5-year); the ZIP list shows the ZIPs whose primary county this is — a ZIP on a border can also serve neighbouring counties.
Sources: U.S. Census Bureau (2020 county relationship file, ACS 5-year) · GeoNames. Methodology.