Johnstown ZIP Codes

List of Zip Codes of Johnstown

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

About Johnstown Colorado Zip Codes

The city of Johnstown in Colorado (CO) is served by approximately 1 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 19,696 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 Johnstown fall within county jurisdictions such as Weld. Each county manages local services, land use, and administration for the areas corresponding to its ZIP Codes.

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