Boulder County, Colorado ZIP codes
26 ZIP codes are in Boulder County, plus 5 that cross in from neighboring counties. It's part of the Boulder, CO metro area.
- ZIP codes
- 26
- Population in these ZIPs
- 285,786
- Avg. median income
- $106,100population-weighted
- Cities & towns
- 14
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Boulder County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 80025 | Eldorado Springs | 138 | $134,102 | — |
| 80026 | Lafayette | 32,701 | $120,187 | $663,100 |
| 80027 | Louisville | 34,127 | $154,232 | $815,000 |
| 80038 PO Box | Broomfield | — | — | — |
| 80301 | Boulder | 25,007 | $95,207 | $689,700 |
| 80302 | Boulder | 29,569 | $61,698 | $1,082,300 |
| 80303 | Boulder | 24,996 | $78,555 | $806,300 |
| 80304 | Boulder | 25,383 | $126,558 | $1,214,800 |
| 80305 | Boulder | 16,291 | $126,107 | $961,900 |
| 80306 PO Box | Boulder | — | — | — |
| 80307 PO Box | Boulder | — | — | — |
| 80308 PO Box | Boulder | — | — | — |
| 80309 PO Box | Boulder | — | — | — |
| 80310 | Boulder | 7,692 | — | — |
| 80314 PO Box | Boulder | — | — | — |
| 80455 | Jamestown | 501 | $169,286 | $534,900 |
| 80466 | Nederland | 3,599 | $100,962 | $662,900 |
| 80471 | Pinecliffe | 0 | — | — |
| 80481 | Ward | 484 | $116,563 | $515,200 |
| 80501 | Longmont | 44,147 | $80,911 | $478,600 |
| 80502 PO Box | Longmont | — | — | — |
| 80503 | Longmont | 35,846 | $113,620 | $726,900 |
| 80510 | Allenspark | 663 | $101,250 | $499,700 |
| 80533 PO Box | Hygiene | — | — | — |
| 80540 | Lyons | 4,642 | $139,521 | $737,500 |
| 80544 | Niwot | 0 | — | — |
ZIP codes partly in Boulder County
These ZIP codes are mostly in a neighboring county but cover part of Boulder County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 80020 | Broomfield | Broomfield County | 54,201 | $117,243 | $562,100 |
| 80403 | Golden | Jefferson County | 20,732 | $151,276 | $853,500 |
| 80504 | Longmont | Weld County | 63,451 | $113,643 | $569,200 |
| 80513 | Berthoud | Larimer County | 18,271 | $126,726 | $603,100 |
| 80516 | Erie | Weld County | 39,048 | $168,725 | $706,500 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in Boulder County
Nearby counties
Frequently asked questions
How many ZIP codes are in Boulder County, Colorado?
26 ZIP codes are mainly in Boulder County, and 5 more ZIP codes from neighboring areas reach partly into it.
What cities are in Boulder County?
ZIP codes in Boulder County use the city names Allenspark, Boulder, Broomfield, Eldorado Springs, Hygiene, Jamestown, Lafayette, Longmont, Louisville, Lyons, Nederland and Niwot and others.
What metro area is Boulder County in?
Boulder County is part of the Boulder, CO metropolitan statistical area.