The US Postal Service is the largest delivery operator in the United States. It was founded in 1775. The popularity of USPS is explained by its convenience, a wide choice of delivery methods and reasonable prices. The Postal Service staff numbers more than 600 thousand people. For the most convenient way of providing employees with necessary working information (schedules, payrolls, benefits, training and career opportunities) the USPS created several corporate websites, access to which is provided through the use of lite blue usps employee login.