18 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 84321 | Logan | 51,702 |
| 84341 | Logan | 25,560 |
| 84335 | Smithfield | 16,210 |
| 84319 | Hyrum | 10,931 |
| 84332 | Providence | 8,954 |
| 84339 | Wellsville | 6,295 |
| 84318 | Hyde Park | 5,604 |
| 84320 | Lewiston | 3,162 |
| 84333 | Richmond | 3,093 |
| 84325 | Mendon | 2,525 |
| 84326 | Millville | 1,949 |
| 84328 | Paradise | 1,681 |
| 84327 | Newton | 921 |
| 84305 | Clarkston | 667 |
| 84338 | Trenton | 526 |
| 84308 | Cornish | 260 |
| 84304 | Cache Junction | 6 |
| 84322 | Logan | 0 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 18 ZCTAs in Cache County, Utah (US Census).