Post Offices in & near Castro Valley, California. Operating hours, locations, phone/fax number, services information.
Post Office in Castro Valley, California on Santa Maria Ave. Operating hours, phone number, services information, and other locations.
Address: 20283 Santa Maria Ave, Castro Valley, CA 94546
Phone: 510-581-0159
Fax: 510-581-4074
Toll-Free: 1-800-Ask-USPS® (275-8777)
TTY: 877-889-2457