Boulder, CO ZIP Codes
Boulder, Colorado has 11 ZIP codes: 5 for street addresses (, , , and ), 3 for PO boxes and 3 for single organizations.
Your street decides which one you use.
Which Boulder ZIP code is my address in?
Street ranges from the Census Bureau, 2026. PO box and organization ZIP codes are not found by street. A new street may be missing: address not found?
Boulder ZIP code map
Tap or point to an area to see its ZIP code.Full-size map
80306, 80307, 80308, 80309, 80310 and 80314 have no area on the map: they are PO box or single-organization ZIP codes. Dashed line: Boulder city limits.
Map: Census Bureau ZIP Code Tabulation Areas (2020) and place limits (2024).
All Boulder ZIP codes by type
| ZIP | Type and post office or station |
|---|---|
| 80301 | street delivery Boulder Sorting and Delivery Center |
| 80302 | street delivery Boulder |
| 80303 | street delivery Boulder Sorting and Delivery Center |
| 80304 | street delivery Boulder Sorting and Delivery Center |
| 80305 | street delivery High Mar |
| 80306 | PO boxes at the Boulder post office Boulder |
| 80307 | PO boxes at the High Mar post office High Mar |
| 80308 | PO boxes at the Boulder Sorting and Delivery Center post office Boulder Sorting and Delivery Center |
| 80309 | one organization Boulder |
| 80310 | one organization Boulder Sorting and Delivery Center |
| 80314 | one organization Boulder Sorting and Delivery Center |
ZIP codes from nearby towns that reach into Boulder
- 80503, mailing town Longmont, covers 2 percent of Boulder
Why your mail may say Boulder when you live outside it
Boulder ZIP codes also cover Gunbarrel, Lazy Acres and Pine Brook Hill, so a letter addressed to Boulder can go to a home outside the city limits.
The reverse happens too: parts of Boulder use 80503, which mails under a neighboring town's name.
A ZIP code does not set your city, school district or tax. Boulder County property records show which city you are in.
Boulder ZIP code questions
What is the main ZIP code for Boulder?
80302, the ZIP code of the main Boulder post office at 1905 15th St.
Which Boulder ZIP codes are for PO boxes only?
80306, 80307 and 80308. Mail to them goes to boxes at the post office, not to street addresses.
What county is Boulder in?
Boulder County.
ZIP codes for towns near Boulder
More towns near Boulder: Northglenn, Thornton, Wheat Ridge, Lakewood, Brighton, Commerce City, Denver, Dakota Ridge, Loveland.
Sources and last checked
USPS ZIP Locale Detail (October 1, 2026), GeoNames (CC BY 4.0), U.S. Census Bureau, HUD-USPS crosswalk.
Checked October 20, 2026. Sources · How we build our lists · Corrections