U
| Name of place | Number of counties | Principal county | Lower zip code | Upper zip code |
|---|---|---|---|---|
| Ucon | 1 | Bonneville County | 83454 | |
| Ulysses | 1 | Lemhi County | ||
| Underkoflers Corner | 1 | Canyon County | ||
| Unity | 1 | Cassia County | 83318 | |
| University | 1 | Latah County | 83843 | |
| Ustick | 1 | Ada County | 83704 |
Read more about this topic: List Of Places In Idaho: L-Z