An online Post Office at your fingertips, the Postal Service’s retail website — usps.com — is open for business 24 hours a day, 7 days a week. One of the most frequently visited government sites, usps.com enables customers to print shipping labels, locate Post Offices, look up ZIP codes, update address information and purchase stamps, among other services. In 2014, we improved usps.com by making it significantly more streamlined and easier to use. Thanks to usps.com, doing business with the Postal Service online has never been easier.