Now Hiring - Great pay & Benefits. Click to Apply. About USPS The United States Postal Service (USPS) is a company that deal in provision of postal services, both shipping and mailing services. The Company serves all Americans regardless of their location at a standard price and quality and is the third-largest civilian employer in the United States after Walmart. The Company is estimated to deliver up to 660 million pieces of mail to the major delivery points. The USPS in collaboration with the Government operates a joint postal system to deliver mail for the military. The Company also started delivering urgent packages over the weekends in February 2013, however, the federal law reversed this change under a parliamentary Act.