United States Post Office

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This local United States Post Office is open six days a week and is conveniently located on Santa Maria Avenue near Castro Valley Boulevard. A variety of mailing and shipping options are available as well as stamps, shipping supplies and P.O Boxes. The United States Post Office also offers online services.
20283 Santa Maria Ave, Castro Valley, CA 94546
(510) 581-0159
  • Fax: 510-581-4074
  • Accessibility Details: Entrance is level with sidewalk.
  • Accessibility Details: The office is ADA compliant.
  • Hours: Daily, 6am – 9pm
  • Hours: Mon - Fri, 8am - 8:30pm; Sat, 8am - 6pm; Sun, closed
  • Accessible: yes
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