Zip Code 80303 — Boulder, CO

ZIP Code 80303 is associated with Boulder, CO, in Boulder County. The listed population estimate is 24,996; estimated density is 441.0 people per square mile. Among records with population estimates, it ranks #8 of 16 in Boulder County and #99 of 512 in CO.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (39.974220, -105.212060)

Data MetricLocal Statistic
Postal / Zip Code80303
Primary CityBoulder
State / ProvinceCO
CountyBoulder
Total Population24,996
Population Density441.0 people/sq mi
TimezoneAmerica/Denver

How 80303 Compares

MetricZIP 80303Boulder County recordsCO records
Population estimate24,996285,786 (sum)5,862,421 (sum)
Population Density441.0 /sq mi----
County population rank#8 of 16----
State population rank#99 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 80305Boulder2.0 mi16,291
ZIP 80027Louisville3.0 mi34,127
ZIP 80310Boulder3.4 mi7,692
ZIP 80301Boulder5.1 mi25,007
ZIP 80025Eldorado Springs5.5 mi138

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 →