Malheur County Oregon (Historic Districts) has 3 places on the National Register of Historic Places including 1 place of National significance. Significant places include Oregon Trail Historic District, Birch Creek Ranch Historic Rural Landscape.
Some of the country's most noteable architects helped create the Malheur County places including Domingo Lequerica. Prominent architectural styles found in Malheur Country are Art Deco and Late 19th And Early 20th Century American Movements.