ZIP code · Boulder · Colorado · United States

ZIP code 80304 — Boulder

ZIP code 80304 serves Boulder, Colorado.

Postal code
80304
Single source Value from one source, not cross-checked.
City
Boulder
County
Boulder FIPS 08013
State
Colorado
Country
United States
Coordinates
40.0375, -105.2771 — precision precise (locality)
View on OpenStreetMap
Population
25,634 (ZCTA, ACS 5-year)
Population density
2,840 / sq mi
Land area
9 sq mi (23.4 km²) (ZCTA, ACS 5-year)
Median household income
$121,534
Per-capita income
$83,292
Median age
41.5
Households
11,179
Housing units
11,717
Median home value
$1,166,100
Median gross rent
$1,956 / month
Congressional district
CO-2 (119th Congress)
USDA hardiness zone
6a (-10 to -5 °F)
Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
Time zone
America/Denver (UTC−7 / UTC−6 DST)
Area codes
720, 303, 983 (from the nearest rate centre)
Telephone area codes serving this ZIP (NANPA central-office assignments). A ZIP and an area code are different boundaries; at a border both codes may apply.

Climate — monthly normals

Warmest month Jul (avg high 88°F), coldest Dec (avg low 21°F).

JanFebMarAprMayJunJulAugSepOctNovDec
Avg high °F474857637183888679665546
Avg low °F222229354351575648372821
Precip in0.81.02.03.03.21.91.81.72.11.61.20.8

NOAA 1991–2020 climate normals from the nearest station: BOULDER (3.2 mi) · NOAA NCEI

Places in ZIP 80304

Places mapped inside this ZIP’s ZCTA area in OpenStreetMap. OSM is community-maintained: counts reflect what has been mapped, and completeness varies by area — treat them as at-least figures. © OpenStreetMap contributors (ODbL) · Methodology

About this page

US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.

GeoNames · U.S. Census Bureau (ACS) · U.S. Census Bureau · NOAA NCEI · usda-phzm. Data generated on 2026-08-21. Methodology · Report an error on this page