Title 39 of the United States Code outlines the role of United States Postal Service in the United States Code. The United States Postal Service (USPS) is an independent establishment of the executive branch of the United States Government (see 39 U.S.C. § 201) responsible for providing postal service in the United States. ... The United States Code (U.S.C.) is a compilation and codification of the general and permanent federal law of the United States. ...