The customer service phone number for the United States Postal Service is 1-800-275-8777 (1-800-ASK-USPS), as of 2015. Its hours of operation are Monday through Friday 8 a.m. to 8:30 p.m. and Saturday 8 a.m. to 6 p.m Eastern time.
The USPS delivers mail to both individuals and business located within the United States. The U.S. Postal Service was originally known as the U.S. Post Office Department. Its name was changed as a result of it becoming an independent agency rather than being run by the U.S. Government. The U.S. Post Office had been established by Congress on July 26, 1775. Benjamin Franklin was named the first postmaster general.