The United States Post Office in Shoreline offers a complete range of shipping and receiving services including P.O. Boxes. The USPS can ship any item that can be legally transported, with special care for fragile packages, insurance, receipt acknowledgement and more. USPS also offers drop boxes both inside and out for local and national shipping. The United States Post Office is also the place to put your mail on hold during vacations, as well as change your address. Many USPS services are available online through the USPS website.