Longmont ZIP Codes

List of Zip Codes of Longmont

The following table lists ZIP Codes associated with Longmont, Colorado, based on ZIP Code Tabulation Area (ZCTA) data from the U.S. Census Bureau.

About Longmont Colorado Zip Codes

The city of Longmont in Colorado (CO) is served by approximately 3 ZIP Codes. These codes cover residential neighborhoods, business districts, and surrounding localities that use the city name in their mailing address.

Based on ZIP-level population estimates, the combined population covered by these ZIP Codes is around 141,102 people. Population density can vary significantly from one ZIP Code to another, reflecting the mix of dense urban blocks, commercial corridors, and lower-density residential areas.

The ZIP Codes associated with Longmont fall within county jurisdictions such as Boulder, Weld. Each county manages local services, land use, and administration for the areas corresponding to its ZIP Codes.

Most ZIP codes for Longmont, Colorado follow the America/Denver time zone.