39 U.S.C. § 101

(a) The United States Postal Service shall be operated as a basic and fundamental service provided to the people by the Government of the United States, authorized by the Constitution, created by Act of Congress, and supported by the people. The Postal Service shall have as its basic function the obligation to provide postal services to bind the Nation together through the personal, educational, literary, and business correspondence of the people. It shall provide prompt, reliable, and efficient services to patrons in all areas and shall render postal services to all communities. The costs of establishing and maintaining the Postal Service shall not be apportioned to impair the overall value of such service to the people. (b) The Postal Service shall maintain an integrated network for the delivery of market-dominant and competitive products (as defined in chapter 36 of this title). Delivery shall occur at least six days a week, except during weeks that include a Federal holiday, in emergency situations, such as natural disasters, or in geographic areas where the Postal Service has established a policy of delivering mail fewer than six days a week as of the date of enactment of the Postal Service Reform Act of 2022. The Postal Service shall provide a maximum degree of effective and regular postal services to rural areas, communities, and small towns where post offices are not self-sustaining. No small post office shall be closed solely for operating at a deficit, it being the specific intent of the Congress that effective postal services be insured to residents of both urban and rural communities. (c) As an employer, the Postal Service shall achieve and maintain compensation for its officers and employees comparable to the rates and types of compensation paid in the private sector of the economy of the United States. It shall place particular emphasis upon opportunities for career advancements of all officers and employees and the achievement of worthwhile and satisfying careers in the service of the United States. (d) Postal rates shall be established to apportion the costs of all postal operations to all users of the mail on a fair and equitable basis. (e) In determining all policies for postal services, the Postal Service shall give the highest consideration to the requirement for the most expeditious collection, transportation, and delivery of important letter mail. (f) In selecting modes of transportation, the Postal Service shall give highest consideration to the prompt, economical, consistent, and reliable delivery of all mail in a manner that increases operational efficiency and reduces complexity. Modern methods of transporting mail by containerization and programs designed to achieve cost-effective overnight transportation to the destination of important letter mail to all parts of the Nation shall also be a primary goal of postal operations. (g) In planning and building new postal facilities, the Postal Service shall emphasize the need for facilities and equipment designed to create desirable working conditions for its officers and employees, a maximum degree of convenience for efficient postal services, proper access to existing and future air and surface transportation facilities, and control of costs to the Postal Service.