The U.S. Postal Service is the only delivery service that reaches every address in the nation: 160 million residences, businesses and Post Office Boxes. With more than 34,000 retail locations and one of the most frequently visited websites in the federal government, usps.com, the Postal Service has annual operating revenue of more than $71 billion and delivers 48 percent of the world’s mail. With more than 630,000 employees, the United States Postal Service is one of the nation’s largest employers.