80304 ZIP Code Guide: Boundaries, Schools, and Services
80304: Where the Boundary Actually Runs
Zip code 80304 takes in three named Boulder neighborhoods and part of one unincorporated mountain community, and one data site lists eight schools under it. Boulder, CO 80304 covers roughly nine square miles on the city's north side, according to ZipDataMaps, and borders zip codes 80301 and 80302 along a seam that splits North Boulder rather than following one obvious street. ZipDataMaps names three neighborhoods inside the zip: Old North Boulder, Parkside, and North Broadway – Holiday. The same source puts the 2022 population at 25,617 people across 11,159 households, spread over a land area that works out to about 2,826 people per square mile.
Zipwise's postal-code lookup classifies 80304 as a "Standard" zip code, observing daylight saving time on Mountain time — consistent with ZipDataMaps' broader listing of 303, 720, and 983 as the area codes serving the zip.
Pine Brook Hill and the Three Named Neighborhoods
Not all of 80304 sits inside Boulder's city limits. City-Data.com attributes 62.28 percent of the zip to the city of Boulder itself and 31.44 percent to Pine Brook Hill, an unincorporated community in Boulder County that shares the mailing zip code without sharing the city's governance. The remainder falls outside either named place, which is part of why a 80304 address can mean a house on Boulder's city grid or a mountain property governed by the county instead.
The housing stock reflects that mix. City-Data counts 12,289 houses and condos in the zip, with 3,585 renter-occupied — a 30 percent rental share, below the 34 percent rental share City-Data reports for Colorado overall. The same source puts the zip's December 2024 cost-of-living index at 117.4, meaning costs there run about 17 percent above the national average the index uses as its baseline of 100.
Who Lives Here: Population, Income, and Housing
Population inside 80304 has grown slowly rather than quickly. City-Data's historical counts put the zip at 24,298 people in 2000 and 25,623 in 2010; its 2024 estimate puts the figure at 25,795, close to ZipDataMaps' own 2022 count of 25,617 — a population that has essentially plateaued over the past decade and a half.
ZipDataMaps reports a 2021 median household income of $98,985 and lists 14.2 percent of households in the zip in its high-income bracket.
Two different unemployment figures appear across the sources because they measure different things. ZipDataMaps reports a current unemployment rate of 4.6 percent for September 2026. City-Data, measuring the share of the 25-and-over population that is unemployed, puts that figure at 4.1 percent, alongside separate findings that 98.3 percent of that population holds a high school diploma or higher, 80.9 percent holds a bachelor's degree or higher, and 45.9 percent holds a graduate or professional degree.
Property taxes track the zip's higher home values rather than a higher tax rate. City-Data reports a 2024 effective property tax rate of 0.5 percent for 80304 — identical to the 0.5 percent rate it reports for Colorado overall — but because 80304 homes carry higher values, the median dollar amount paid is larger: $7,023 for the zip against $2,828 statewide. ZipDataMaps separately lists the zip's 2025 sales tax rate at 9 percent.
Schools Listed for 80304
ZipDataMaps places the zip in Boulder Valley School District RE-2 and lists five elementary schools under 80304 — Crest View Elementary School, Foothill Elementary School, Columbine Elementary School, Whittier Elementary School, and Flatirons Elementary School — plus two middle schools, Centennial Middle School and Casey Middle School, and one high school, Boulder High School. A list like this is not an attendance map: some of these schools sit near the zip's edge, and which one a given address feeds into is set by the district's attendance boundaries, not by the postal code.
Three of those elementary schools also carry a second designation. The city's Family Resource Schools program, a partnership between the City of Boulder and Boulder Valley School District, runs at Columbine, Creekside, Crest View, University Hill, and Whittier International elementary schools. Of those five, Columbine, Crest View, and Whittier are on ZipDataMaps' 80304 list; Creekside and University Hill are not. The program is run through the city's Housing & Human Services department and covers case management for basic needs, afterschool enrichment programs, counseling for students dealing with trauma, referrals to other community resources, parent workshops and classes, and neighborhood outreach — each tailored, per the city's description, to the specific needs of that school's community.
The program's contact details are on the city's Family Resource Schools page; its office is at 909 Arapahoe Avenue, in the neighboring 80302 zip code rather than 80304. The same page flags that Boulder Valley School District now provides breakfast and lunch free to all students, but still asks families to file the free-and-reduced-meal application anyway, since that paperwork also waives or reduces district-wide athletics, activity, and technology fees and factors into school funding.
Family, Teen, and Mental Health Resources
One resource on the City of Boulder's own teen mental health resource list sits physically inside the zip: Boulder County Public Health, at 3450 Broadway Street, Boulder, CO 80304, open weekdays from 8 a.m. to 4 p.m. and reachable at 303-441-1100. The department's stated mission is addressing the social, economic, and environmental conditions that affect the chance of a healthy life across the county.
Several other resources on the same city list sit just outside the zip or serve the wider region. Clinica Family Health & Wellness — formed when Mental Health Partners merged into Clinica Family Health in 2024 — provides medical, dental, and mental health care as a safety-net provider across Adams, Boulder, Broomfield, and Gilpin counties, reachable at 303-443-8500. Boulder Valley School District's own mental health service provides free, school-based counseling, crisis intervention, and family support during school hours, available to any enrolled student by teacher referral, parent referral, or self-referral, at 303-447-1010. TGTHR, a nonprofit working to end youth homelessness across the Boulder and Denver area, serves people ages 12 to 24 out of 1440 Pine Street in neighboring 80302 — open daily from 12:30 to 5 p.m., with an overnight shelter for ages 12 to 20 opening at 8 p.m., reachable at 303-447-1206 for its office or 303-447-1207 for the shelter line.
The same city page also lists services that work by phone, text or online chat rather than from a Boulder address, among them Teen Line, The Trevor Project, iMatter Colorado, the Second Wind Fund and 7 Cups; its listings carry each one's current numbers and hours.
Climate and Elevation Notes
ZipDataMaps places 80304 in USDA Plant Hardiness Zone 6a, where winter lows can reach between -10°F and -5°F, with an average first fall frost arriving October 1–10 and an average last spring frost running May 1–10. The same source classifies the zip under the Köppen-Geiger Dfb designation — a humid continental climate with a mild summer and precipitation spread across the year — inside the Front Range Fans ecoregion. Averaged across the year, ZipDataMaps lists a minimum temperature of 34°F, a maximum of 63°F, and 19.59 inches of precipitation.
At a Glance
- Zip code: 80304, Boulder, CO — map the boundary
- County: Boulder County
- School district: Boulder Valley School District RE-2
- Elementary schools listed for the zip: Crest View, Foothill, Columbine, Whittier, Flatirons
- Middle and high schools listed for the zip: Centennial Middle School, Casey Middle School, Boulder High School
- Named neighborhoods: Old North Boulder, Parkside, North Broadway – Holiday
- Also inside the zip: part of Pine Brook Hill
- Adjacent zip codes: 80301, 80302
- Boulder County Public Health office in 80304: 3450 Broadway St, 303-441-1100
For a household weighing a move to 80304, or a family trying to confirm which school a new address feeds into, the zip code's boundary tells only part of the story — school assignment, Family Resource Schools eligibility, and the nearest county health office all depend on the specific street, not the zip as a whole. The contacts above are the starting points for sorting that out directly.