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The Green River Post Office, constructed in 1931-32, is significant from both architectural and local history standpoints. It represents a fine example of a distinct type of construction and also tells much about the development of the town of Green River. The building is a well preserved example of Neo-Classical architecture. The building and its floor plan is typical of any number of small town post offices constructed throughout the nation under the massive federal building programs of the Depression Era. It was the first federally constructed post office in the city of Green River and was an event that local citizens had worked for and anticipated for years.