The United States Postal Service (USPS) is a reliable and affordable delivery service that processes and delivers 47% of the world's mail. With over 30,000 retail locations, USPS is committed to providing secure and efficient delivery to more than 157 million addresses in the United States and its territories. Customers praise the friendly and patient staff at the 31 Milk St Lbby location, who offer walk-in passport services and guide even the most inexperienced customers through the process. The spacious and convenient financial district facility is described as surprisingly empty during lunch hours, with a cool-looking entrance and efficient service. Reviewers highlight the good attitude and patience of the staff, particularly the "fabulous" and "friendly" Ms. Connie, who caters to the needs of small business owners and other customers.