ZIP Codes in Castle Rock, CO
Castle Rock uses 3 ZIP codes, all in Douglas County. Pick one below for details, or look up the full nine-digit ZIP+4 for a specific street address.
All 3 Castle Rock ZIP codes
| ZIP | Type | County | Population |
|---|---|---|---|
| 80104 | standard | Douglas | 38,479 |
| 80108 | standard | Douglas | 36,730 |
| 80109 | standard | Douglas | 28,400 |
Finding a ZIP+4 in Castle Rock
Knowing which of these 3 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 Castle Rock 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 Castle Rock addresses and download it complete.