ZIP Codes in San Marcos, CA
San Marcos uses 3 ZIP codes, all in San Diego County. Pick one below for details, or look up the full nine-digit ZIP+4 for a specific street address.
All 3 San Marcos ZIP codes
| ZIP | Type | County | Population |
|---|---|---|---|
| 92069 | standard | San Diego | 47,335 |
| 92078 | standard | San Diego | 53,605 |
| 92096 | standard | San Diego | — |
Finding a ZIP+4 in San Marcos
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 San Marcos street almost always have different ZIP+4 codes even though they share all five leading digits.
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Upload a CSV of San Marcos addresses and download it complete.