Zip Code 80305 — Boulder, CO

ZIP Code 80305 is associated with Boulder, CO, in Boulder County. The listed population estimate is 16,291; estimated density is 1,080.7 people per square mile. Among records with population estimates, it ranks #9 of 16 in Boulder County and #143 of 512 in CO.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (39.977330, -105.248770)

Data MetricLocal Statistic
Postal / Zip Code80305
Primary CityBoulder
State / ProvinceCO
CountyBoulder
Total Population16,291
Population Density1,080.7 people/sq mi
TimezoneAmerica/Denver

How 80305 Compares

MetricZIP 80305Boulder County recordsCO records
Population estimate16,291285,786 (sum)5,862,421 (sum)
Population Density1,080.7 /sq mi----
County population rank#9 of 16----
State population rank#143 of 512----

Regional sums combine the population estimates in the listed ZIP records; they are not official county or state population totals.

Explore More ZIP Codes

Nearby ZIP Codes in CO

ZIP CodeCityDistancePopulation estimate
ZIP 80303Boulder2.0 mi24,996
ZIP 80310Boulder2.0 mi7,692
ZIP 80025Eldorado Springs4.3 mi138
ZIP 80027Louisville4.9 mi34,127
ZIP 80304Boulder5.2 mi25,383

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →