From staff reports:

Effective Saturday, April 24, postal customers in ZIP Code 98003 who have their mail delivered to their street address will have to go to the Twin Lakes Post Office, 1815 SW Campus Drive, to pick up any mail the letter carrier was unable to deliver that requires a signature or parcels that could not be left, according to a statement released by USPS Seattle area spokesman Ernie Swanson.

On that day the carriers that work out of the Federal Way Post Office, 32829 Pacific Highway S., will be transferred to the Twin Lakes Post Office. The Federal Way Post Office will remain open as a retail postal facility. Customers who rent a post office box at that location will continue to get their mail there.

There will be no impact to customers with ZIP Code 98023.