Idaho counties
Every county in Idaho, with the ZIP codes recorded in each. Pick one to see its full ZIP code list.
- counties
- 44
- ZIP codes
- 320
All Idaho counties
| County | ZIP codes | Largest city |
|---|---|---|
| Ada County | 34 | Boise |
| Adams County | 4 | Council |
| Bannock County | 12 | Pocatello |
| Bear Lake County | 9 | Bern |
| Benewah County | 6 | Desmet |
| Bingham County | 10 | Aberdeen |
| Blaine County | 7 | Sun Valley |
| Boise County | 7 | Banks |
| Bonner County | 16 | Blanchard |
| Bonneville County | 11 | Idaho Falls |
| Boundary County | 5 | Bonners Ferry |
| Butte County | 3 | Arco |
| Camas County | 3 | Corral |
| Canyon County | 15 | Nampa |
| Caribou County | 5 | Bancroft |
| Cassia County | 6 | Albion |
| Clark County | 2 | Dubois |
| Clearwater County | 6 | Ahsahka |
| Custer County | 5 | Challis |
| Elmore County | 6 | Atlanta |
| Franklin County | 6 | Clifton |
| Fremont County | 8 | Ashton |
| Gem County | 4 | Emmett |
| Gooding County | 4 | Bliss |
| Idaho County | 13 | Cottonwood |
| Jefferson County | 8 | Hamer |
| Jerome County | 3 | Eden |
| Kootenai County | 14 | Coeur d'Alene |
| Latah County | 12 | Moscow |
| Lemhi County | 10 | Carmen |
| Lewis County | 5 | Craigmont |
| Lincoln County | 3 | Dietrich |
| Madison County | 4 | Rexburg |
| Minidoka County | 4 | Heyburn |
| Nez Perce County | 4 | Culdesac |
| Oneida County | 2 | Holbrook |
| Owyhee County | 5 | Bruneau |
| Payette County | 3 | Fruitland |
| Power County | 3 | American Falls |
| Shoshone County | 12 | Avery |
| Teton County | 4 | Driggs |
| Twin Falls County | 9 | Twin Falls |
| Valley County | 5 | Cascade |
| Washington County | 3 | Cambridge |
Scope every county-equivalent recorded in Idaho. Source Census 2024 county Gazetteer (2024 Gazetteer) and GeoNames US postal codes (2026-07 postal dump). Updated . Names and boundaries follow the Census Bureau's current county-equivalent set, not the ID postal source's older names.