County ZIP codes · Illinois · FIPS 17067
Hancock County, IL ZIP Codes
Hancock County, Illinois has 21 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 20 residential and 1 for PO boxes or a single organization. 16 of the residential ones lie mainly in Hancock County and 4 mainly in a neighboring county; 12 cross the county line. Median household income ranges from $61,042 in 62330 (Dallas City) to $76,825 in 62321 (Carthage) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Hancock 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 $62,200 and $65,000.
They carry 20 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 20 residential ZIP codes in Hancock County
16 ZIP codes lie mainly in Hancock County; 4 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 62321 | Carthage | 3,576 | 21 | $77k | $124k | 100% |
| 62341 | Hamilton | 3,433 | 74 | $62k | $137k | 100% |
| 62379 | Warsaw | 1,854 | 19 | $62k | $103k | 80% |
| 61450 | La Harpe | 1,812 | 24 | $60k | $95k | 89% |
| 62330 | Dallas City | 1,472 | 17 | $61k | $97k | 91% |
| 62354 | Nauvoo | 1,447 | 40 | $73k | $160k | 100% |
| 62367 | Plymouth | 1,294 | 10 | $58k | $127k | 38% |
| 62311 | Augusta | 872 | 18 | $48k | $101k | 49% |
| 62316 | Bowen | 705 | 16 | $61k | $84k | 89% |
| 62358 | Niota | 525 | 13 | $62k | $165k | 100% |
| 62313 | Basco | 382 | 9 | $109k | $133k | 100% |
| 62380 | West Point | 360 | 9 | $75k | $83k | 100% |
| 62373 | Sutter | 225 | 5 | $111k | $140k | 97% |
| 62374 | Tennessee | 216 | 9 | $79k | $82k | 51% |
| 62334 | Elvaston | 163 | 201 | $39k | $127k | 100% |
| 62336 | Ferris | 84 | 525 | $43k | $77k | 100% |
Partly in Hancock 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?
12 ZIP codes of Hancock County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Hancock | Elsewhere |
|---|---|---|
| 62326 | 5% | McDonough County95% |
| 62351 | 5% | Adams County95% |
| 62379 | 80% | Adams County20% |
| 61450 | 89% | Henderson County7%; McDonough County4% |
| 62330 | 91% | Henderson County9% |
| 62367 | 38% | McDonough County34%; Schuyler County28% |
| 61420 | 19% | McDonough County81% |
| 62311 | 49% | Schuyler County40%; Adams County12% |
| 62316 | 89% | Adams County11% |
| 62349 | 9% | Adams County91% |
| 62373 | 97% | Adams County3% |
| 62374 | 51% | McDonough County49% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 62329 | Colusa |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Hancock County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Hancock County's ZIP codes use 2 prefixes: 614 and 623.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.