Post Offices

Post Offices in & near Castro Valley, California. Operating hours, locations, phone/fax number, services information.

Castro Valley Post Office

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

Retail Hours

Monday 9:00am - 5:00pm
Tuesday 9:00am - 5:00pm
Wednesday 9:00am - 5:00pm
Thursday 9:00am - 5:00pm
Friday 9:00am - 5:00pm
Saturday 9:00am - 1:00pm
Sunday Closed

Lobby Hours

Monday 24 hours
Tuesday 24 hours
Wednesday 24 hours
Thursday 24 hours
Friday 24 hours
Saturday 24 hours
Sunday 24 hours

Last Collection Times

Monday 5:00pm
Tuesday 5:00pm
Wednesday 5:00pm
Thursday 5:00pm
Friday 5:00pm
Saturday 4:00pm
Sunday Closed