Castro Valley zipcode
| City | Castro Valley |
| ZIP Code | 94546 |
| Type | Standard |
| State Code | CA |
| State | California |
ZIP code of Castro Valley is 94546. This place is located in California state in US. To send any postal service to Castro Valley, you must use 94546 zipcode.
The ZIP code 94546 is also used with 1 more city name of California.
- Hayward, CA