Yuma County Arizona (Vacant / Not In Use) has 6 places on the National Register of Historic Places including 4 places of National significance and 2 places of Statewide significance. Significant places include Blaisdell Slow Sand Filter Washing Machine, McPhaul Suspension Bridge, Robertson, Peter T., House, San Ysidro Hacienda and Antelope Hill Highway Bridge.
Some of the country's most noteable architects helped create the Yuma County places including Hiram W. Blaisdell, Levy Construction Co., Ralph Modjeski, Southern Pacific Railroad Co. and Perry Borchers. Prominent architectural styles found in Yuma Country are Stick/Eastlake.