Idaho ZIP codes
Idaho holds 320 ZIP codes between 83201 and 83877. The tables rank the places and counties with the most codes; the guide below decodes the numbering.
Places with the most ZIP codes in Idaho
| Place | ZIP codes |
|---|---|
| Boise | 28 |
| Idaho Falls | 7 |
| Pocatello | 6 |
| Nampa | 5 |
| Meridian | 3 |
| Caldwell | 3 |
| Coeur d'Alene | 3 |
| Rexburg | 3 |
| Sun Valley | 2 |
| Post Falls | 2 |
| Moscow | 2 |
| Twin Falls | 2 |
| Eagle | 1 |
| Kuna | 1 |
| Star | 1 |
| Garden City | 1 |
| Council | 1 |
| Indian Valley | 1 |
| Mesa | 1 |
| New Meadows | 1 |
Idaho counties by ZIP count
| County | ZIP codes |
|---|---|
| Ada | 34 |
| Bonner | 16 |
| Canyon | 15 |
| Kootenai | 14 |
| Idaho | 13 |
| Bannock | 12 |
| Latah | 12 |
| Shoshone | 12 |
| Bonneville | 11 |
| Bingham | 10 |
Reading a Idaho ZIP code
Idaho holds 320 ZIP codes between 83201 and 83877, spread over 44 counties. Boise leads the state with 28 codes, ahead of Idaho Falls with 7. Every code here opens with the digit 8: that opening number is the national postal region Idaho belongs to, the next two digits name the sectional center that sorts the mail, and the final two point to the local office. A ZIP+4 suffix narrows delivery to a block face. Boundaries follow carrier routes rather than city limits, which is why Boise spreads across 28 codes while some rural codes cross county lines.
Source: GeoNames postal dataset (CC BY 4.0), snapshot of 2026-07-09. Counts cover standard delivery ZIPs listed for Idaho; unique and PO box codes may add to these totals.
Last updated: · Methodology and sources