A bit of history from the Hartford Historical Society:
Built in 1934 as a WPA Project, this building has seen life as a post office, Vermont District Court and as a privately owned office building. Located at the northeast corner of South Main and Gates Street, it is a Neo-Classical Revival-style brick building with a round, arched opening and the inscription “United States Post Office” on its front. The first post office in White River Junction opened in 1849 after the town became a major railhead and was located at or near the train depot. It moved in 1890 to the Gates Block and subsequently relocated to this building in 1934. It was replaced by a new distribution center, built outside the historic district in 1964.