ZIP CodesZIP codes in Fremont County, Idaho
Fremont County, Idaho has 8 ZIP codes in this list, from 83420 to 83451. They cover 8 places, among them Ashton, Chester, Island Park and Macks Inn.
| ZIP code | Place | Land area (sq mi) | Map point |
|---|---|---|---|
| 83420 | Ashton | 411 | 44.015, -111.425 |
| 83421 | Chester | 11.7 | 44.001, -111.535 |
| 83429 | Island Park | 495 | 44.447, -111.368 |
| 83433 | Macks Inn | 1.6 | 44.319, -111.602 |
| 83436 | Newdale | 100 | 43.888, -111.604 |
| 83438 | Parker | 0.1 | 43.959, -111.758 |
| 83445 | Saint Anthony | 301 | 43.963, -111.704 |
| 83451 | Teton | 16.6 | 43.891, -111.650 |
The ZIP code areas of Fremont County add up to about 1,336 square miles of land (3,460 sq km) as the Census Bureau draws them. The largest is 83429 (Island Park), with 495 square miles.
Using these codes
- In an address, the ZIP code comes last, after the city and the two-letter state: Ashton, ID 83420.
- 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.