Length: 255.291 mi. Direction: south-north. South Dakota Highway 73 (SD-73) is a highway in the western part of South Dakota that begins north of Merriman at the Nebraska state line, and ends in Thunder Hawk at the North Dakota state line. The road stretches across the counties of Bennett, Jackson, Haakon, Ziebach, Meade, Perkins, and Corson. It was opened in 1926.
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