Union City Post Office

33170 Alvarado Niles Rd, Union City, CA 94587

Contact Numbers

Phone: 510-471-1180
Fax: 510-471-0306
TTY: 877-889-2457
Toll-Free: 1-800-Ask-USPS® (275-8777)

Retail Hours

Lobby Hours
PO Box Access Available

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 5:00pm
Sunday Closed

Passport Acceptance Hours

Monday 9:00am - 2:00pm
Tuesday 9:00am - 2:00pm
Wednesday 9:00am - 2:00pm
Thursday 9:00am - 2:00pm
Friday 9:00am - 2:00pm
Saturday Closed
Sunday Closed

  • Visit our Passport FAQ page for a complete overview of what to bring, what you need to know, and how long it will take.
  • You will need two forms of Identification with copies.
  • A passport quality photo. Available at location.
  • The appropriate application form printed and filled out, and the required fee for applying or renewing.
  • You can find up to date costs, information, and forms at the State Departments Travel Site

  • Bulk Mail Acceptance
  • Bulk Mail Account Balance
  • Bulk Mail New Permit
  • Burial Flags
  • Business Line
  • Business Reply Mail Account Balance
  • Business Reply Mail New Permit
  • Duck Stamps
  • General Delivery
  • Money Orders (Domestic)
  • Money Orders (Inquiry)
  • Money Orders (International)
  • Packaged Stamps
  • Passport Acceptance
  • Passport Photo
  • Philatelic Services
  • Pickup Accountable Mail
  • Pickup Hold Mail
  • PO Box Online
  • Sure Money
  • Street Parking

Visit our Links Page for links to Holiday Schedule, Change of Address, Hold Mail/Stop Delivery, PO Box rentals and fees, and Available Jobs.

*Please call to verify information. Is anything incorrect? Let us know here

Nearby Post Offices:

3861 Smith St
1.5 miles away

37010 Dusterberry Way
1.9 miles away

6655 Clark Ave
2.6 miles away

160 J St
2.7 miles away


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Tried calling in to get information regarding my passport renewal. No answer at all Over the course of 3 days. Walked into office to get information regarding passport renewal. Terrible customer service . She basically told me to go take my picture elsewhere and to read my forms to figure out how to get an expedited return. TERRIBLE customer service .... and I know nothing more now than before asking them for help.


Spent over an hour trying to call this post office as instructed by the customer service number. No one picked up the phone.


At approx. 7:00 pm I tried to deposit-insert my parcel into the lobby parcel box. It was jammed, however there was someone inside the work area. I asked her to remove the item and she refused. I understand that "no one" is working at this time. However, there was someone there. How did the employee get in the back work area? She was not alone, there was also someone else she was talking to. Would it have created so much trouble if the jammed parcel be removed? So, customers could continue to use the self service kiosk? If this happened to me, I know this must be a continuous issue. Very poor service.

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