Find the last 4 digits (ZIP+4) for an address in 80305

ZIP 80305, Boulder, CO is filled in. Just type the street address.

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ZIP Code 80305 – Boulder, CO

Boulder, Colorado · Boulder County · Mountain time

ZIP code80305
CityBoulder
StateColorado
CountyBoulder County
Population16,291
Time zoneMountain · local time
ZIP typeStandard (has a Census ZCTA area)
Land area5.82 sq mi
Center (lat, long)39.9769, -105.2487

Area codes in this area

303720983

These are the area codes that most often serve ZIP 80305 (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

80310 Boulder · 2 mi80303 Boulder · 2.1 mi80309 Boulder · 2.9 mi80025 Eldorado Springs · 4.4 mi80027 Louisville · 5.1 mi80304 Boulder · 5.1 mi80301 Boulder · 5.4 mi80302 Boulder · 6.2 mi

About ZIP 80305

ZIP code 80305 is assigned to Boulder, Colorado. It lies in Boulder County. Its Census area covers about 5.82 square miles of land. The closest neighboring ZIP is 80310 (Boulder), about 2 miles away.

Every address in 80305 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