U.S. Post Office and Courthouse—Havre Main - Credit: Wikimedia Commons
The U.S. Post Office and Courthouse–Havre Main, located in Havre, Montana, was designed by the Office of the Supervising Architect under James A. Wetmore in Classical Revival style and was built in 1932. Also known as Havre Post Office and Courthouse or Havre Main Post Office, it served historically as a courthouse and as a post office. It was listed on the National Register of Historic Places in 1986. Read more on Wikipedia
Source: en.wikipedia.org