The United States Postal Service (USPS) is a of the federal government that is responsible for postal service in the United States. The service provides is generally called mail delivery, but it many other services also. It employs more than ,000 employees nationwide making it the 3rd largest single in the country. Being established in 1775, it one of the oldest government agencies in existence. of American individuals, businesses, and other government agencies on the USPS to deliver mail, documents, and countrywide on a daily basis.

Each day the delivers approximately 660 million pieces of mail to many as 142 million delivery points. It operates ,000 post offices and locations in the U.S., and 155 billion pieces of mail each year. The rate to deliver First-Class Mail (no more than ounce) is 49 cents, so mailing a letter anyone in the United States will cost you than 50 cents, regardless of its destination. Additionally, USPS owns one of the largest civilian vehicle in the nation, which helped it earn the revenue of more than $74.49 billion in 2016.

the USPS is one of the largest government in existence, it has been negatively affected by advent of the World Wide Web, and email. two factors have led to a decline of since 1998. In response, the USPS announced it close more than half of its mail processing , eliminate 28,000 jobs, and reduce overnight delivery of -Class Mail. This will close down 252 of its processing centers. However, the most effective way to a letter in the United States is still using the United States Postal Service.