Windsor, CO ZIP Codes
Windsor, Colorado has 2 ZIP codes: for street addresses and for a single organization.
Mail addressed to Windsor covers nearby places too.
Where the 80550 ZIP code reaches
Tap or point to an area to see its ZIP code.Full-size map
80551 has no area on the map: it is a PO box or single-organization ZIP code. Dashed line: Windsor town limits.
Map: Census Bureau ZIP Code Tabulation Areas (2020) and place limits (2024).
Check an address in Windsor
Street ranges from the Census Bureau, 2026. PO box and organization ZIP codes are not found by street. A new street may be missing: address not found?
Windsor PO box and business ZIP codes
| ZIP | Type and post office or station |
|---|---|
| 80550 | street delivery Windsor |
| 80551 | one organization Windsor |
ZIP codes from nearby towns that reach into Windsor
- 80528, mailing town Fort Collins, covers 6 percent of Windsor
- 80631, mailing town Greeley, covers 6 percent of Windsor
Why your mail may say Windsor when you live outside it
Windsor ZIP codes also cover Severance, so a letter addressed to Windsor can go to a home outside the town limits.
The reverse happens too: parts of Windsor use 80528 and 80631, which mail under a neighboring town's name.
A ZIP code does not set your city, school district or tax. Weld County property records show which city you are in.
Windsor ZIP code questions
What is the main ZIP code for Windsor?
80550, the ZIP code of the main Windsor post office at 215 6th St.
What county is Windsor in?
Weld County, with parts in Larimer County.
ZIP codes for towns near Windsor
More towns near Windsor: Brighton, Boulder, Broomfield, Thornton, Northglenn, Commerce City, Westminster, Cheyenne, Arvada.
Sources and last checked
USPS ZIP Locale Detail (October 1, 2026), GeoNames (CC BY 4.0), U.S. Census Bureau, HUD-USPS crosswalk.
Checked October 20, 2026. Sources · How we build our lists · Corrections