| ZIP Codes: | 25 ZIP Codes (14 Standard, 8 PO Box, 3 Unique) [See All] |
| Area Codes: | 303 / 720 / 970 / 983 |
| Timezone: | Mountain (GMT -07:00) |
| Local Time: | 2:11:31 PM |
| Population: | 324,171 [See All] |
| FIPS: | 08013 |
| CBSA: | Boulder, CO |
| Land Area: | 734 sq mi |
| Water Area: | 12 sq mi |
| Coordinates: | 40.0517, -105.2616 |
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324,171 residents live across 25 ZIPs covering 734 sq mi, served by 13 distinct USPS-recognized cities.
Population moved from 290,887 to 324,171 from 2014 to 2024 — a +11.4% change. 10 ZIPs gained residents, 6 lost (and 2 held flat).
The county's wealthiest ZIP 80516 (Erie, $168,725 median) and poorest ZIP 80302 (Boulder, $61,698) are 20.1 miles apart — a 2.7× income gap across local geography.
Median home values vary 2.5× across this county — from $488,800 in 80501 (Longmont) to $1,210,200 in 80304 (Boulder).
Density varies 1954× across the county — from 27 people/sq mi in 80466 (Nederland) to 53,715 in 80310 (Boulder).
Educational attainment ranges from 40.3% bachelor's+ in 80501 (Longmont) to 80.1% in 80303 (Boulder) — the breadth of educational profiles across the area.
Within Colorado, this is the #9 most populous of 65 counties and ranks #6 for median household income with the #17 fastest decade growth .
On the national stage, Boulder County is ranks #94 for income .
Hosts 3 single-entity Unique ZIPs: 80309University Of Colorado ; 80310Univ Of Co Dorms ; and 80314Ibm Corp .
Weighted by population, the typical household earns about $113,857 across the county — reflecting what a typical resident sees, not a simple ZIP average.
65.5% of adults age 25+ hold a bachelor's degree or higher (141,455 of 215,942 reporting). The most-educated ZIPs cluster around Boulder.
14 Standard delivery, 8 PO Box only, 3 single-entity Unique ZIPs serve this county.
11 ZIPs in this county where more than 60% of adults 25+ hold a bachelor's degree — typically college campuses, research enclaves, or tech corridors.
3 ZIP codes in this county serve a single facility — typically theme parks, universities, large corporations, airports, or government complexes.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 80501 | Longmont | Standard | 44,147 | $80,911 | 12.7 | 7.2% |
| 80516 | Erie | Standard | 39,048 | $168,725 | 38.7 | 77.6% |
| 80503 | Longmont | Standard | 35,846 | $113,620 | 97.5 | 9.8% |
| 80027 | Louisville | Standard | 34,127 | $154,232 | 19.6 | 6.8% |
| 80026 | Lafayette | Standard | 32,701 | $120,187 | 22.4 | 19.4% |
| 80302 | Boulder | Standard | 29,569 | $61,698 | 91.8 | 5.6% |
| 80304 | Boulder | Standard | 25,383 | $126,558 | 9.2 | -4.1% |
| 80301 | Boulder | Standard | 25,007 | $95,207 | 32.5 | 4.3% |
| 80303 | Boulder | Standard | 24,996 | $78,555 | 34.9 | 6.3% |
| 80305 | Boulder | Standard | 16,291 | $126,107 | 7.2 | -6.4% |
| 80310 | Boulder | Unique | 7,692 | — | 0.1 | 16.0% |
| 80540 | Lyons | Standard | 4,642 | $139,521 | 161.7 | -5.0% |
| 80466 | Nederland | Standard | 3,599 | $100,962 | 130.9 | 10.1% |
| 80455 | Jamestown | Standard | 501 | $169,286 | 16.3 | -5.6% |
| 80481 | Ward | Standard | 484 | $116,563 | 45.5 | -37.8% |
| 80025 | Eldorado Springs | PO Box | 138 | $134,102 | 12.2 | -45.0% |
| 80471 | Pinecliffe | PO Box | 0 | — | 0.0 | — |
| 80544 | Niwot | PO Box | 0 | — | 0.1 | — |
| 80502 | Longmont | PO Box | — | — | 0.0 | — |
| 80308 | Boulder | PO Box | — | — | 0.0 | — |
| 80306 | Boulder | PO Box | — | — | 0.0 | — |
| 80314 | Boulder | Unique | — | — | 0.0 | — |
| 80309 | Boulder | Unique | — | — | 0.4 | — |
| 80307 | Boulder | PO Box | — | — | 0.0 | — |
| 80533 | Hygiene | PO Box | — | — | 0.0 | — |