Post Offices in & near Mercer Island, Washington. Operating hours, locations, phone/fax number, services information.
Post Office in Mercer Island, Washington on 78th Ave SE. Operating hours, phone number, services information, and other locations.
Address: 3040 78th Ave SE, Mercer Island, WA 98040
Phone: 206-232-8834
Fax: 651-456-6210
Toll-Free: 1-800-Ask-USPS® (275-8777)
TTY: 877-889-2457
