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The Casper Federal Building is a massive three-story Classical Revival style office building composed of reinforced concrete and brick tiles faced with red pressed brick trimmed with Wyoming sandstone. It was erected in 1932 to house the post office, the federal court system, and other federal agencies. The building reflects the expansion of federal facilities in the United States during the early twentieth century. The interior is significant for its District Courtroom with original wood paneling, millwork, and trim, and its judge's bench, witness box, and elaborated entrances. The building represents the work of the Office of the Supervising Architect of the Treasury Department during the tenure of James A. Wetmore. The building was formally renamed the ''Ewing T. Kerr Federal Building in 1992. Kerr was a former Wyoming Attorney General and U.S. District Court judge. The building is now occupied by the U.S. District Court, the US. Bankruptcy Court, the U.S. Attorney, and the U.S. Marshal.