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| Zip Code | State | Type | County | City | Area Code |
|---|---|---|---|---|---|
| Search for a ZIP code to see details | |||||
| County | ZIP Code | Major City | Type | Area Code |
|---|---|---|---|---|
| Boulder | 80025 | Eldorado Springs, Eldorado Sprg | PO Box | 303 |
| Boulder | 80026 | Lafayette | Standard | 303 |
| Boulder | 80027 | Louisville, Superior | Standard | 303 |
| Boulder | 80028 | Louisville | Unique | 303 |
| Boulder | 80301 | Boulder | Standard | 303 |
| Boulder | 80302 | Boulder | Standard | 303 |
| Boulder | 80303 | Boulder | Standard | 303 |
| Boulder | 80304 | Boulder | Standard | 303 |
| Boulder | 80305 | Boulder | Standard | 303 |
| Boulder | 80306 | Boulder | PO Box | 303 |
| Boulder | 80307 | Boulder | PO Box | 303 |
| Boulder | 80308 | Boulder | PO Box | 303 |
| Boulder | 80309 | Boulder | Unique | 303 |
| Boulder | 80310 | Boulder | Unique | 303 |
| Boulder | 80314 | Boulder | Unique | 303 |
| Boulder | 80321 | Boulder | Unique | 303 |
| Boulder | 80322 | Boulder | Unique | 303 |
| Boulder | 80323 | Boulder | Unique | 303 |
| Boulder | 80328 | Boulder | Unique | 303 |
| Boulder | 80329 | Boulder | Unique | 303 |
| Boulder | 80455 | Jamestown | Standard | 720 |
| Boulder | 80466 | Nederland | Standard | 970 |
| Boulder | 80471 | Pinecliffe | PO Box | 303 |
| Boulder | 80481 | Ward | Standard | 303 |
| Boulder | 80501 | Longmont | Standard | 303 720 |
| Boulder | 80502 | Longmont | PO Box | 303 |
| Boulder | 80503 | Longmont, Niwot | Standard | 303 720 |
| Boulder | 80504 | Longmont, Firestone, Frederick, Niwot | Standard | 303 720 |
| Boulder | 80510 | Allenspark | Standard | 720 303 |
| Boulder | 80533 | Hygiene | PO Box | 303 |
| Boulder | 80540 | Lyons | Standard | 303 720 |
| Boulder | 80544 | Niwot | PO Box | 303 |