| Primary City | Castro Valley | |
| Population | 61,388 | |
| State | California | |
| County | Alameda County | |
| Current Time | ||
| Zip Codes | 94546, 94552 | |
| Area Codes | 510, 510 |
Neighbouring Zip Codes
ZIP Code: 94502
Alameda, California
ZIP Code: 94501
Alameda, California
ZIP Code: 94507
Alamo, California
ZIP Code: 94506
Danville, California
ZIP Code: 94526
Danville, California
ZIP Code: 94568
Dublin, California
ZIP Code: 94555
Fremont, California
ZIP Code: 94539
Fremont, California
ZIP Code: 94557
Hayward, California
ZIP Code: 94552
Castro Valley, California
ZIP Code: 94546
Castro Valley, California
ZIP Code: 94545
Hayward, California
ZIP Code: 94575
Moraga, California
ZIP Code: 94570
Moraga, California
ZIP Code: 94588
Pleasanton, California
ZIP Code: 94568
Dublin, California
ZIP Code: 94566
Pleasanton, California
ZIP Code: 94579
San Leandro, California
ZIP Code: 94578
San Leandro, California
ZIP Code: 94580
San Lorenzo, California
ZIP Code: 94583
San Ramon, California
ZIP Code: 94582
San Ramon, California
ZIP Code: 94587
Union City, California
Neighbouring Cities
Hayward, Cherryland, Ashland, San Lorenzo, Dublin, San Ramon, San Leandro, Danville, Union City, Alamo, Pleasanton, Moraga, Blackhawk, Alameda, Fremont