Grant County Oregon (Vacant / Not In Use) has 4 places on the National Register of Historic Places including 1 place of Statewide significance. Significant places include Fremont Powerhouse, Advent Christian Church, Dayville Hotel, Sumpter Valley Railway Historic District.
Some of the country's most noteable architects helped create the Grant County places including E. W. Cummings, Joseph A. West and Samuel Bayliss Hope. Prominent architectural styles found in Grant Country are Gothic and Romanesque.