Port Costa Post Office

3 Canyon Lake Dr, Port Costa, CA 94569

Contact Numbers

Phone: 510-787-2980
Fax: 510-874-8544
TTY: 877-889-2457
Toll-Free: 1-800-Ask-USPS® (275-8777)

Retail Hours

Lobby Hours
PO Box Access Available

Monday 10:00am - 2:00pm
Tuesday 10:00am - 2:00pm
Wednesday 10:00am - 2:00pm
Thursday 10:00am - 2:00pm
Friday 10:00am - 2:00pm
Saturday 8:00am - 12:00pm
Sunday Closed

Last Collection Times

Monday 2:00pm
Tuesday 2:00pm
Wednesday 2:00pm
Thursday 2:00pm
Friday 2:00pm
Saturday 12:00pm
Sunday Closed

*This facility does not process US Passports applications or renewals. Check nearby locations below.

  • Burial Flags
  • Business Line
  • General Delivery
  • Money Orders (Domestic)
  • Money Orders (Inquiry)
  • Money Orders (International)
  • Pickup Accountable Mail
  • Pickup Hold Mail
  • PO Box Online
  • Sure Money

Visit our Links Page for 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:

290 E L St
1.3 miles away

695 Pomona St
1.4 miles away

815 Court St
2.3 miles away

4100 Alhambra Ave
3.0 miles away


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Absolutely HORRENDOUS service. They're only open 4 hours a day and half the time not even that. Their rules are ridiculous about letting other people-who live in your household and have the ID to prove it and are also listed as box holder-pick up your mail. They will return mail that doesn't have a PO Box listed on it. They hound you repeatedly to pay your box fees by sending emails and putting notes in your box. Worst of all, if they put your email in someone else's PO Box their answer is "people make mistakes." Why that's so helpful! Too bad I'll never receive what I paid for. You have wonder what they do all day. It must be so taxing sorting the mail for a tiny town like ours.

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