Castro Valley zipcode
| City | Castro Valley |
| ZIP Code | 94552 |
| Type | Standard |
| State Code | CA |
| State | California |
ZIP code of Castro Valley is 94552. This place is located in California state in US. To send any postal service to Castro Valley, you must use 94552 zipcode.
The ZIP code 94552 is also used with 1 more city name of California.
- Hayward, CA