County ProfileCO
Boulder County
Population: 330,758 · 25 ZIP codes
Demographics
Source: U.S. Census Bureau (ACS/Decennial). Estimates vary by year.
People
Total population
330,758
People
Median age
37.7
Housing
Total households
137,008
Income
Median household income
$103,994
Housing
Total housing units
144,729
Employment
Employment rate
63.6%
Education
Bachelor’s degree or higher
64.2%
Healthcare
Insured population
95.6%
County details
Local time 02:45:08(MT)| Name | Boulder |
|---|---|
| Total ZIP codes | 25total |
| ZIP codes (by type) | 15 Standard7 PO Box3 Unique |
| Area code | 303, 720, 983 |
| Timezone | Mountain Time (MT) |
| Coordinates | 40.0949712, -105.3977104 |
| Land area | 726.4 sq miles(1,881.4 km²) |
Map of Boulder county, Colorado with ZIP codes
Cities and Communities in Boulder County
Compare the largest cities in Boulder County by population, median income, and growth. Use the table below to analyze key demographic shifts across the region.
| City | Population | Median incomeHousehold | ZIP codes |
|---|---|---|---|
| Boulder | 108,250 | $87,493 | 11ZIPs |
| Longmont | 98,885 | $90,671 | 4ZIPs |
| Lafayette | 30,411 | $119,040 | 1ZIPs |
| Louisville | 21,226 | $147,319 | 1ZIPs |
| Niwot | 4,306 | $146,492 | 1ZIPs |
| Lyons | 2,209 | $122,837 | 1ZIPs |
| Nederland | 1,471 | $122,917 | 1ZIPs |
| Allenspark | 568 | $108,056 | 1ZIPs |
| Eldorado Springs | 559 | $133,008 | 1ZIPs |
| Jamestown | 256 | $149,375 | 1ZIPs |
| Ward | 128 | $56,875 | 1ZIPs |
| Pinecliffe | 37 | — | 1ZIPs |
— Data unavailable or suppressed by the U.S. Census Bureau for areas with small sample sizes to protect individual privacy.
ZIP Codes in Boulder County
Review the most populated postal areas across Boulder County. Use the ranking below to compare resident density and demographic scales between the county's major zones.
| ZIP | City | Median incomeHousehold | Population (ZIP) |
|---|---|---|---|
| 80504 | Longmont | $113,643 | 60,183 |
| 80501 | Longmont | $80,911 | 42,822 |
| 80503 | Longmont | $113,620 | 35,863 |
| 80027 | Louisville | $154,232 | 34,413 |
| 80026 | Lafayette | $120,187 | 32,318 |
| 80304 | Boulder | $126,558 | 27,532 |
| 80302 | Boulder | $61,698 | 27,322 |
| 80301 | Boulder | $95,207 | 25,944 |
| 80303 | Boulder | $78,555 | 25,328 |
| 80305 | Boulder | $126,107 | 17,283 |
| 80310 | Boulder | — | 8,281 |
| 80540 | Lyons | $139,521 | 4,710 |
| 80466 | Nederland | $100,962 | 3,332 |
| 80481 | Ward | $116,563 | 544 |
| 80455 | Jamestown | $169,286 | 517 |
| 80510 | Allenspark | $101,250 | 439 |
| 80025 | Eldorado Springs | $134,102 | 212 |
| 80544 | Niwot | — | 138 |
| 80471 | Pinecliffe | — | 37 |
| 80306 | Boulder | — | — |
Data Sources & Citations
The geographic and demographic information presented on this site is compiled from publicly available, authoritative sources, including:
- United States Census BureauDemographic, population, housing, and socioeconomic data sourced from Census Bureau datasets, including the Decennial Census and the American Community Survey (ACS).Census Data
- United States Postal Service (USPS)ZIP code classifications, delivery types, and postal designations used for reference purposes. USPS ZIP codes are intended for mail delivery and may not always align exactly with Census geographic boundaries.USPS