ZIP CodesZIP codes in Sioux County, Iowa
Sioux County, Iowa has 13 ZIP codes in this list, from 51003 to 51250. They cover 13 places, among them Alton, Chatsworth, Granville and Hawarden.
Nothing in this county matches.
| ZIP code | Place | Land area (sq mi) | Map point |
|---|---|---|---|
| 51003 | Alton | 54.3 | 42.978, -96.017 |
| 51011 | Chatsworth | 0.4 | 42.916, -96.514 |
| 51022 | Granville | 76.2 | 42.969, -95.897 |
| 51023 | Hawarden | 120 | 43.001, -96.473 |
| 51027 | Ireton | 90.0 | 42.967, -96.323 |
| 51036 | Maurice | 42.6 | 42.963, -96.165 |
| 51041 | Orange City | 70.9 | 43.019, -96.056 |
| 51234 | Boyden | 49.8 | 43.203, -95.982 |
| 51238 | Hospers | 49.2 | 43.079, -95.914 |
| 51239 | Hull | 67.0 | 43.195, -96.139 |
| 51244 | Matlock | 0.4 | 43.244, -95.935 |
| 51247 | Rock Valley | 113 | 43.201, -96.310 |
| 51250 | Sioux Center | 73.3 | 43.081, -96.180 |
The ZIP code areas of Sioux County add up to about 807 square miles of land (2,089 sq km) as the Census Bureau draws them. The largest is 51023 (Hawarden), with 120 square miles.
Using these codes
- In an address, the ZIP code comes last, after the city and the two-letter state: Alton, IA 51003.
- 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.