Idaho ZIP Codes: Ranges, Prefixes and Major Cities
Whether you are building an address form, cleaning a mailing list or testing shipping rules, it helps to know how ZIP codes work in Idaho. The state has 317 active codes spread across 44 counties.
ZIP code range and prefixes
Every Idaho ZIP code starts with one of 7 three-digit prefixes. Each prefix points to a sectional center facility, the processing plant that sorts mail for a group of nearby post offices.
- 832
- 833
- 834
- 835
- 836
- 837
- 838
Types of ZIP codes in Idaho
| Type | Count | What it covers |
|---|---|---|
| Standard | 250 | Street delivery areas |
| PO Box | 52 | Post office boxes only |
| Unique | 15 | A single high-volume organization |
ZIP codes for major Idaho cities
| City | County | Standard ZIPs | Range |
|---|---|---|---|
| Boise | Ada County | 10 | 83702–83716 |
| Idaho Falls | Bonneville County | 4 | 83401–83406 |
| Nampa | Canyon County | 3 | 83651–83687 |
| Pocatello | Bannock County | 3 | 83201–83204 |
| Caldwell | Canyon County | 2 | 83605–83607 |
| Coeur D Alene | Kootenai County | 2 | 83814–83815 |
| Meridian | Ada County | 2 | 83642–83646 |
| Aberdeen | Bingham County | 1 | 83210–83210 |
| Ahsahka | Clearwater County | 1 | 83520–83520 |
| Albion | Cassia County | 1 | 83311–83311 |
| American Falls | Power County | 1 | 83211–83211 |
| Arbon | Power County | 1 | 83212–83212 |
| Arco | Butte County | 1 | 83213–83213 |
| Arimo | Bannock County | 1 | 83214–83214 |
| Ashton | Fremont County | 1 | 83420–83420 |
Boise is the state capital. Larger cities have many ZIP codes because each code follows mail delivery routes, not city limits.
Sample addresses
Lisa Brown
5286 Pine Way
Meridian, ID 83646
Linda Clark
1601 Chestnut Rd
Ashton, ID 83420
Emily Reed
6143 Forest Pl
Caldwell, ID 83607
These examples use real city and ZIP pairs with invented street lines, so they are safe for testing and documentation.
Tips for working with these ZIP codes
- Store ZIP codes as text, not numbers, so the format stays consistent across states with leading zeros.
- Idaho spans more than one time zone (Mountain and Pacific). Use the ZIP code or county, not the state, to decide local time.
- A quick sanity check: a valid ID ZIP code begins with one of the prefixes listed above.
- City names in addresses are post office names. A suburb may share a ZIP code and city name with a nearby larger town.
Create realistic Idaho addresses for testing, with real cities, counties and ZIP codes.
Generate Idaho addresses