County ZIP codes · Illinois · FIPS 17023
Clark County, IL ZIP Codes
Clark County, Illinois has 10 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 7 of the residential ones lie mainly in Clark County and 3 mainly in a neighboring county; 9 cross the county line. Median household income ranges from $59,555 in 62449 (Oblong) to $80,738 in 62441 (Marshall) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Clark County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $59,555 and $70,284.
They carry 10 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 10 residential ZIP codes in Clark County
7 ZIP codes lie mainly in Clark County; 3 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 62441 | Marshall | 7,003 | 40 | $81k | $156k | 96% |
| 62420 | Casey | 4,299 | 35 | $66k | $140k | 57% |
| 62442 | Martinsville | 2,671 | 19 | $70k | $87k | 98% |
| 62474 | Westfield | 626 | 17 | $67k | $88k | 64% |
| 62423 | Dennison | 546 | 22 | $47k | $173k | 66% |
| 62477 | West Union | 526 | 9 | $89k | $111k | 100% |
| 62478 | West York | 333 | 11 | $99k | $131k | 54% |
Partly in Clark County
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
9 ZIP codes of Clark County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Clark | Elsewhere |
|---|---|---|
| 62441 | 96% | Edgar County 4% |
| 62420 | 57% | Cumberland County 36%; Coles County 5%; Jasper County 2% |
| 62449 | 1% | Crawford County 81%; Jasper County 18% |
| 62442 | 98% | Crawford County 2% |
| 61933 | 6% | Edgar County 93% |
| 62474 | 64% | Coles County 36% |
| 62423 | 66% | Edgar County 34% |
| 62478 | 54% | Crawford County 46% |
| 62413 | 9% | Crawford County 91% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
Which first three digits do Clark County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Clark County's ZIP codes use 2 prefixes: 619 and 624.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.