Thornburg Iowa ZIP Codes
Thornburg holds a single ZIP code.
Every ZIP code in Thornburg
| ZIP code | County |
|---|---|
| 50255 | Keokuk 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Thornburg codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for Thornburg. 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 Thornburg ZIP code begins 502. Those first three digits identify the sectional center facility that processes mail for this part of Iowa. Statewide that range covers 65 ZIP codes, so Thornburg accounts for 2% of it.
Every Iowa ZIP prefix and the region it covers →
Area codes covering Thornburg
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 Thornburg occupies.
Thornburg Iowa area codes in full →
Where Thornburg's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near Thornburg
| City | Distance | ZIP codes |
|---|---|---|
| Gibson Iowa ZIP codes | 3.5 mi | 1 ZIP code |
| What Cheer Iowa ZIP codes | 4.0 mi | 1 ZIP code |
| Keswick Iowa ZIP codes | 4.9 mi | 1 ZIP code |
| Barnes City Iowa ZIP codes | 7.9 mi | 1 ZIP code |
| Deep River Iowa ZIP codes | 8.9 mi | 1 ZIP code |
| Delta Iowa ZIP codes | 9.2 mi | 1 ZIP code |
| Sigourney Iowa ZIP codes | 11 mi | 1 ZIP code |
| Rose Hill Iowa ZIP codes | 12 mi | 1 ZIP code |
Straight-line distance between place reference points, not driving distance.