Find the last 4 digits (ZIP+4) for an address in 80304

ZIP 80304, Boulder, CO is filled in. Just type the street address.

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ZIP Code 80304 – Boulder, CO

Boulder, Colorado · Boulder County · Mountain time

ZIP code80304
CityBoulder
StateColorado
CountyBoulder County
Population25,383
Time zoneMountain · local time
ZIP typeStandard (has a Census ZCTA area)
Land area9.03 sq mi
Center (lat, long)40.0447, -105.2884

Area codes in this area

303720983

These are the area codes that most often serve ZIP 80304 (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.

Map

Nearby ZIP codes

80309 Boulder · 2.3 mi80310 Boulder · 3.2 mi80302 Boulder · 3.5 mi80301 Boulder · 4.6 mi80305 Boulder · 5.1 mi80308 Boulder · 5.3 mi80307 Boulder · 5.4 mi80314 Boulder · 5.4 mi

About ZIP 80304

ZIP code 80304 is assigned to Boulder, Colorado. It lies in Boulder County. Its Census area covers about 9.03 square miles of land. The closest neighboring ZIP is 80309 (Boulder), about 2.3 miles away.

Every address in 80304 also has a 4-digit add-on code (ZIP+4) that points to a smaller delivery area. Use the box above to find it.

Sources: US Census Bureau (ZCTA, county relationship files), GeoNames (CC BY 4.0), NANPA via NumberResearch.org (CC BY 4.0). Map © OpenStreetMap contributors. ZIP areas are approximate. Population: U.S. Census Bureau, ACS 5-year estimates, 2024 (ZCTA). Data sources