ZIP CodesZIP codes in Shelby County, Iowa
Shelby County, Iowa has 9 ZIP codes in this list, from 51446 to 51578. They cover 9 places, among them Irwin, Kirkman, Defiance and Earling.
| ZIP code | Place | Land area (sq mi) | Map point |
|---|---|---|---|
| 51446 | Irwin | 35.8 | 41.775, -95.192 |
| 51447 | Kirkman | 36.7 | 41.731, -95.267 |
| 51527 | Defiance | 42.3 | 41.805, -95.354 |
| 51530 | Earling | 53.7 | 41.792, -95.421 |
| 51531 | Elk Horn | 27.3 | 41.583, -95.070 |
| 51537 | Harlan | 164 | 41.644, -95.311 |
| 51562 | Panama | 34.0 | 41.729, -95.487 |
| 51565 | Portsmouth | 45.7 | 41.648, -95.511 |
| 51578 | Westphalia | 0.1 | 41.720, -95.395 |
The ZIP code areas of Shelby County add up to about 439 square miles of land (1,137 sq km) as the Census Bureau draws them. The largest is 51537 (Harlan), with 164 square miles.
Using these codes
- In an address, the ZIP code comes last, after the city and the two-letter state: Irwin, IA 51446.
- Tap a ZIP code to open it in the look-up, with a copy button for the address line.
- A code can cross a county line, and one town can have several codes. The table shows the main place of each code.
- "No area" means the Census Bureau draws no area for that code. Such codes are usually for post office boxes or a single building.
Places and counties: GeoNames. Areas: U.S. Census Bureau, 2024 ZIP Code Tabulation Areas. Checked in November 2026. This site is not connected with the United States Postal Service; for mailing, confirm the address with USPS.