Cromwell Iowa ZIP Codes
Cromwell holds a single ZIP code.
Every ZIP code in Cromwell
| ZIP code | County |
|---|---|
| 50842 | Union County |
We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Cromwell codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for Cromwell. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated . ZIP codes are delivery-route groupings, not areas; the boundaries implied by any ZIP map are approximations.
How these codes cluster
Every Cromwell ZIP code begins 508. Those first three digits identify the sectional center facility that processes mail for this part of Iowa. Statewide that range covers 28 ZIP codes, so Cromwell accounts for 4% of it.
Every Iowa ZIP prefix and the region it covers →
Area codes covering Cromwell
ZIP codes and area codes are separate systems — one routes mail, the other routes calls — and they do not share boundaries. The code below serves the same ground Cromwell occupies.
These codes are associated with Cromwell through county-level matching, not a per-address guarantee.
Cromwell Iowa area codes in full →
Where Cromwell's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near Cromwell
| City | Distance | ZIP codes |
|---|---|---|
| Creston Iowa ZIP codes | 5.2 mi | 1 ZIP code |
| Prescott Iowa ZIP codes | 8.0 mi | 1 ZIP code |
| Orient Iowa ZIP codes | 12 mi | 1 ZIP code |
| Lenox Iowa ZIP codes | 12 mi | 1 ZIP code |
| Afton Iowa ZIP codes | 14 mi | 1 ZIP code |
| Arispe Iowa ZIP codes | 14 mi | 1 ZIP code |
| Shannon City Iowa ZIP codes | 14 mi | 1 ZIP code |
| Corning Iowa ZIP codes | 15 mi | 1 ZIP code |
Straight-line distance between place reference points, not driving distance.