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The Mt. Sinai Synagogue in Cheyenne, Laramie County, Wyoming is locally significant under criterion C for architecture. This building meets the requirements of criteria consideration A as a unique local example of mid-century Modernism. Mt. Sinai Synagogue represents the need for the relatively small and isolated Jewish community within the city of Cheyenne to maintain its strong religious ties to one another and maintain their deeply held beliefs and traditions, and for its reflection of the history of the Jewish population in Cheyenne since the founding of the city through modern times. It’s also a significant local example of the Mid-Century Modern style of architecture. The building retains integrity of location, design, materials, feeling and association with its simple, clean lines, large, undecorated walls, flat roof, and horizontal window banding. Construction of the synagogue began in 1949, was halted for roughly a year, and a cornerstone dedicated in 1950 when construction began again. The building is still used by the Mt. Sinai congregation for their Jewish faith and traditions.