USPS

Official website: www.usps.com

USPS is an independent agency of the United States Federal Government. With 596,000 employees and 218,684 cars, it is the world's largest civilian fleet. It processes 17.7 billion letters each year, accounting for 40% of the global volume. USPS is one of the few institutions mentioned in the US Constitution. On July 19, 2018, the Fortune Global 500 list was released, and USPS ranked 123rd.