ZIP Codes in Westminster, CO
Westminster uses 2 ZIP codes, all in Adams County. Pick one below for details, or look up the full nine-digit ZIP+4 for a specific street address.
All 2 Westminster ZIP codes
| ZIP | Type | County | Population |
|---|---|---|---|
| 80030 | standard | Adams | 15,427 |
| 80031 | standard | Adams | 35,584 |
Finding a ZIP+4 in Westminster
Knowing which of these 2 ZIP codes covers an address only gets you partway. The four-digit extension identifies the specific delivery point — typically one side of one block. Two houses facing each other on the same Westminster street almost always have different ZIP+4 codes even though they share all five leading digits.
Appending ZIP+4 to a mailing list?
Upload a CSV of Westminster addresses and download it complete.