Zip Code 80501 — Longmont, CO

ZIP Code 80501 is associated with Longmont, CO, in Boulder County. The listed population estimate is 44,147; estimated density is 1,350.9 people per square mile. Among records with population estimates, it ranks #1 of 16 in Boulder County and #25 of 512 in CO.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (40.164790, -105.102080)

Data MetricLocal Statistic
Postal / Zip Code80501
Primary CityLongmont
State / ProvinceCO
CountyBoulder
Total Population44,147
Population Density1,350.9 people/sq mi
TimezoneAmerica/Denver

How 80501 Compares

MetricZIP 80501Boulder County recordsCO records
Population estimate44,147285,786 (sum)5,862,421 (sum)
Population Density1,350.9 /sq mi----
County population rank#1 of 16----
State population rank#25 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 80504Longmont3.8 mi63,451
ZIP 80503Longmont5.6 mi35,846
ZIP 80544Niwot5.6 miN/A
ZIP 80542Mead7.3 mi5,155
ZIP 80516Erie8.9 mi39,048

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 →