ZIP Code 80309 – Boulder, CO
Boulder, Colorado · Boulder County · Mountain time
| ZIP code | 80309 |
|---|---|
| City | Boulder |
| State | Colorado |
| County | Boulder County |
| Population | Not published (no Census ZIP area) |
| Time zone | Mountain · local time |
| ZIP type | PO box or unique ZIP (no Census area) |
| Center (lat, long) | 40.0150, -105.2705 |
Area codes in this area
These are the area codes that most often serve ZIP 80309 (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.
Map
Nearby ZIP codes
About ZIP 80309
ZIP code 80309 is assigned to Boulder, Colorado. It lies in Boulder County. It is a PO-box-only or single-address ZIP, so the Census Bureau does not publish an area for it; the location shown is approximate. The closest neighboring ZIP is 80310 (Boulder), about 0.9 miles away.
Every address in 80309 also has a 4-digit add-on code (ZIP+4) that points to a smaller delivery area. Use the box above to find it.
Sources: US Census Bureau (ZCTA, county relationship files), GeoNames (CC BY 4.0), NANPA via NumberResearch.org (CC BY 4.0). Map © OpenStreetMap contributors. ZIP areas are approximate. Population: U.S. Census Bureau, ACS 5-year estimates, 2024 (ZCTA). Data sources