Preston Main Post Office

The Preston Main Post Office, located at 55 E. Oneida St. in Preston, Idaho, was built in 1940. It was listed on the National Register of Historic Places in 1989 as US Post Office-Preston Main.

Its Classical Revival design is credited to Louis A. Simon.

The interior includes a New Deal mural depicting U.S. cavalry attacking and burning a Native American village, titled "The Battle of Bear River". The approximately 5x12 ft mural was painted by Edmond J. Fitzgerald in 1941.