The San Marino Post Office is a full-service United States post office, complete with shipping boxes, PO boxes, greeting cards, quick drop-offs and more. It features a large counter where employees assist customers in shipping, stamp needs and other post office duties. Customers can find several shipping options and accessories along the walls as they wait in line, including one-price boxes, tape and labels. International shipping is available, as is overnight. Shopping can also be done online.