United States Postal Service is a self-supporting government enterprise serving the nation. Located at Flagstaff, Ariz., the firm reaches around 150 million residences, businesses and post office boxes. With 32,000 retail locations the postal service delivers nearly 40 percent of the world's mail. It offers a range of services, including mailing, shipping, parcel post, media mail, money transfer and international delivery. Additionally, it offers products, such as stamps, personalized stamped envelopes, greeting/post cards and customized direct mailings. The United States Postal Service has been named the Most Trusted Government Agency six consecutive years and the sixth Most Trusted Business in the nation by the Ponemon Institute.