The US Post Office—Easthampton Main is a historic post office building at 19 Union Street in Easthampton, Massachusetts.The Neo-Classical single story building was built in 1933 for a cost (of land and construction) of about $75,000. The architect is unknown, but the building design resembles the work of Knox Taylor, who designed a number of post offices earlier in the 20th century. The brick building features limestone trim, and has a central portico supported by Corinthian columns.The building was listed on the National Register of Historic Places in 1986. It is currently being used as a senior center.