Palo Alto, CA ZIP Codes
Palo Alto, California has 7 ZIP codes: 5 for street addresses (, , , and ) and 2 for PO boxes ( and ).
Your street decides which one you use.
Which Palo Alto 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?
Palo Alto ZIP code map
Tap or point to an area to see its ZIP code.Full-size map
94302 and 94309 have no area on the map: they are PO box or single-organization ZIP codes. Dashed line: Palo Alto city limits.
Map: Census Bureau ZIP Code Tabulation Areas (2020) and place limits (2024).
All Palo Alto ZIP codes by type
| ZIP | Type and post office or station |
|---|---|
| 94022 | street delivery; mail may be addressed to Los Altos Loyola Corners |
| 94301 | street delivery Palo Alto Sorting and Delivery Center |
| 94302 | PO boxes at the Hamilton post office Hamilton |
| 94303 | street delivery Palo Alto Sorting and Delivery Center |
| 94304 | street delivery Veterans Bureau Hospital |
| 94306 | street delivery Cambridge |
| 94309 | PO boxes at the Stanford post office Stanford |
ZIP codes from nearby towns that reach into Palo Alto
- 94028, mailing town Portola Valley, covers 9 percent of Palo Alto
- 95033, mailing town Los Gatos, covers 6 percent of Palo Alto
Why your mail may say Palo Alto when you live outside it
Palo Alto ZIP codes also cover Los Altos Hills, Los Altos and East Palo Alto, so a letter addressed to Palo Alto can go to a home outside the city limits.
The reverse happens too: parts of Palo Alto use 94028 and 95033, which mail under a neighboring town's name.
A ZIP code does not set your city, school district or tax. Santa Clara County property records show which city you are in.
Palo Alto ZIP code questions
What is the main ZIP code for Palo Alto?
94301, the ZIP code of the main Palo Alto Sorting and Delivery Center post office at 2085 E Bayshore Rd.
Which Palo Alto ZIP codes are for PO boxes only?
94302 and 94309. Mail to them goes to boxes at the post office, not to street addresses.
What county is Palo Alto in?
Santa Clara County.
ZIP codes for towns near Palo Alto
More towns near Palo Alto: Newark, Santa Clara, Saratoga, Fremont, Foster City, Campbell, Milpitas, San Mateo, Los Gatos.
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