The U.S. Post Office in Grafton is one of nine built in North Dakota between 1932 and 1940. The U.S. Treasury Department used standardized plans for the buildings and local organizations tried vigorously to influence the design, but to no avail. The building is one of three North Dakota examples of the Colonial Revival style of post office design, with the noticeable front portico columns.

This building is open Monday-Friday 8:30 am to 11 am, Noon to 4:45 pm, and from 9 to 10 am Saturday.