Mercer Island Post Office

3040 78th Ave SE, Mercer Island, WA 98040

Contact Numbers

Phone: 206-232-8834
Fax: 651-456-6210
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 4:15pm
Sunday Closed

Passport Appointment Hours*

Monday 9:45am - 2:45pm
Tuesday 9:45am - 2:45pm
Wednesday 9:45am - 2:45pm
Thursday 9:45am - 2:45pm
Friday 9:45am - 2:45pm
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

*An appointment is required to apply for or renew US Passports. Please Call or schedule online.

Bulk Mail Acceptance Hours

Monday 10:00am - 1:00pm
Tuesday 10:00am - 1:00pm
Wednesday 10:00am - 1:00pm
Thursday 10:00am - 1:00pm
Friday 10:00am - 1:00pm
Saturday Closed
Sunday Closed

  • 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)
  • Passport Acceptance
  • Passport Photo
  • Pickup Accountable Mail
  • Pickup Hold Mail
  • PO Box Online
  • Sure Money
  • Lot Parking
  • Passport Appointment Hours

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:

816 Evergreen Point Rd
1.4 miles away

Bellevue Way Carrier Annex
1171 Bellevue Way NE
1.9 miles away

3642 33rd Ave S Ste C2
2.4 miles away

12400 SE 38th St
2.4 miles away


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We are very happy with our letter carrier in Mercer Island, WA. But we are very alarmed that he is making in person deliveries (where signature is required) without wearing a mask and offering a shared pen for the signature. If he is making multiple deliveries a day like this, he is at risk of getting infected with covid-19 as well as spreading it to many postal customers. If he is not being provided with a mask, the policy needs to change. If he is being provided with a mask and has chosen not to use it, then I would like to know how I can report this. As I said, we have no issue with him at all, but we find it very disturbing how easily he could be spreading this infection. Thank you.


We have not received our mail for 2 days 72nd ave se. First hill Are you delivering We see him go up the 72nd hill yet not down on our side ? Please let us know what we can do


My wife Diane Wong and I live at 8925 SE 54th Street in the Parkwood area of Mercer Island. We are increasingly frustrated that we are getting mail intended for our neighbors on our street or on adjacent streets multiple times each week. Each time this happens we have to hand-deliver the misdirected mail to our neighbors. We do not understand why there is so much mis-sorted mail in recent months, but we hope this problem can be corrected. Thank you.

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