Whiteside County ZIP Codes
Whiteside County is a county of Illinois.
- ZIP codes
- 12
- Cities & towns
- 12
- Area codes
- 4
- Land area
- 684 sq mi
Every ZIP code in Whiteside County
| ZIP code | City |
|---|---|
| 61037 | Galt |
| 61071 | Rock Falls |
| 61081 | Sterling |
| 61230 | Albany |
| 61243 | Deer Grove |
| 61250 | Erie |
| 61251 | Fenton |
| 61252 | Fulton |
| 61261 | Lyndon |
| 61270 | Morrison |
| 61277 | Prophetstown |
| 61283 | Tampico |
We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Whiteside County codes above are listed without a column we would have to invent.
Cities and towns in Whiteside County
A further 2 places in Whiteside County appear in the postal source without a page of its own; their codes are in the table above and each one links to its own page.
Area codes covering Whiteside County
Telephone and postal boundaries are drawn by different bodies, so these codes overlap the county without matching its edges.
Where Whiteside County's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Scope every ZIP code recorded in Whiteside County. Source GeoNames US postal codes (2026-07 postal dump), Census 2024 county Gazetteer (2024 Gazetteer) and geoinfo-dataset (full_dataset) ZIP→NPA (2018 snapshot). Updated . The outline is a convex envelope of ZIP reference points, not a jurisdiction boundary.