Yellowstone County Montana (Historic Districts) has 6 places on the National Register of Historic Places including 1 place of Statewide significance. Significant places include Hoskins Basin Archeological District, Billings Historic District, Billings Townsite Historic District (Boundary Increase), Black Otter Trail.
Prehistoric cultural affiliation(s) include Native American dating back to 500.
Some of the country's most noteable architects helped create the Yellowstone County places including J. Crowe. Prominent architectural styles found in Yellowstone Country are Beaux Arts, Italianate and Late 19th And 20th Century Revivals.