San Marcos, CA ZIP Codes
San Marcos, California has 4 ZIP codes: 2 for street addresses ( and ), 1 for PO boxes () and 1 for a single organization.
Your street decides which one you use.
Which San Marcos ZIP code is my address in?
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?
San Marcos ZIP code map
Tap or point to an area to see its ZIP code.Full-size map
92079 and 92096 have no area on the map: they are PO box or single-organization ZIP codes. Dashed line: San Marcos city limits.
Map: Census Bureau ZIP Code Tabulation Areas (2020) and place limits (2024).
All San Marcos ZIP codes by type
| ZIP | Type and post office or station |
|---|---|
| 92069 | street delivery San Marcos |
| 92078 | street delivery San Marcos |
| 92079 | PO boxes at the San Marcos post office San Marcos |
| 92096 | one organization San Marcos |
Why your mail may say San Marcos when you live outside it
San Marcos ZIP codes also cover Lake San Marcos and Harmony Grove, so a letter addressed to San Marcos can go to a home outside the city limits.
A ZIP code does not set your city, school district or tax. San Diego County property records show which city you are in.
San Marcos ZIP code questions
What is the main ZIP code for San Marcos?
92069, the ZIP code of the main San Marcos post office at 420 N Twin Oaks Valley Rd.
Which San Marcos ZIP codes are for PO boxes only?
92079. Mail to it goes to boxes at the post office, not to street addresses.
What county is San Marcos in?
San Diego County.
ZIP codes for towns near San Marcos
More towns near San Marcos: Fallbrook, San Diego, Santee, Temecula, El Cajon, La Mesa, Spring Valley, Murrieta, La Presa.
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