United States Post Office, Federal post office building in downtown Phoenix, United States.

The United States Post Office in Phoenix is a two-story federal building with Spanish Colonial Revival design elements, including a tiled hip roof and three principal elevations with mirrored east and west sections. The first floor maintains active postal services while the upper level houses Arizona State University offices, student organizations, and the ASU Police Department.

The building was constructed between 1932 and 1936 by architectural firm Lescher and Mahoney and opened on September 29, 1936 in response to urban growth. Its construction occurred during the Great Depression, a period of significant economic hardship for the nation.

In 1938 the Treasury Department's Fine Arts Section commissioned La Verne Black and Oscar E. Berninghaus to paint two murals each in the public lobby, where they remain. The lobby runs the width of the first floor, with office suites to the north and post office boxes and the workroom to the south.

The main entrance is easily accessible for visitors who want to view the architectural features or use the active postal services on the ground floor. The building is located in downtown Phoenix and surrounded by other business district buildings, making it easy to find.

The original design called for a six-story structure, but high land costs led to a redesign that resulted in the current two-story configuration. This compromise shaped the building's distinctive appearance in downtown Phoenix's skyline.