Rupert became a village in 1904. It was originally called Wellfirst because it had the only well within miles and people traveled long distances to get their supply of water from the well, which was located in the middle of the Historic Rupert Square Park.
An employee of the railroad brought mail to the settlers in 1904, whose name was John Henry Rupert. The railroad put the name Rupert on his mailbag and soon the town was named Rupert.
The first post office was established in July of 1905 and W.N. Schilling was the first Postmaster, who also opened the Rupert Mercantile Companying May of 1905 on the west side of the square.
Rupert was platted by engineers of the Reclamation Service. The Village of Rupert was incorporated on April 12, 1906. M.M. Mackay was Rupert's first Mayor.
The beautiful Historic Square sets the town apart from South Central Idaho where most celebrations such as the July 4th and Christmas festivities.
Rupert officially became "Christmas City USA" in November 1987.
Rupert is also home to the beautiful Wilson Theatre that has been restored, inside and out, back to its original charming 1920 design.