South Dakota Highway 20
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Route of SD 20 (in red)
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| Route information | |
| Defined by SDCL §31-4-145 | |
| Maintained by SDDOT | |
| Length: | 428.852 mi (690.170 km) |
| Existed: | 1929 – present |
| Western section | |
| Length: | 389.828 mi (627.367 km) |
| West end: | Montana state line near Camp Crook |
| Major junctions: |
 US 85 in Buffalo US 12 in Mobridge US 83 in Selby US 281 west of Mellette
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| East end: |
 US 212 in Watertown
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| Eastern section | |
| Length: | 39.024 mi (62.803 km) |
| West end: |
  I-29 / US 81 west of South Shore
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| East end: |
 MN 40 at the Minnesota state line east of Revillo
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| Location | |
| Counties: | Harding, Perkins, Ziebach, Dewey, Corson, Walworth, Potter, Faulk, Spink, Clark, Codington, Grant |
| Highway system | |
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South Dakota Highway 20 (SD 20) is a state route that largely runs from border to border across the northern part of the U.S. state of South Dakota. It is one of the state's most rural highways.
South Dakota Highway 20 consists of two segments. The longer segment begins at the Montana border west of Camp Crook, and terminates at the junction of U.S. Route 212 (US 212) in Watertown. This segment is just less than 390 miles (630 km) in length. A second segment begins just west of an interchange with Interstate 29 (I-29) and US 81. It continues eastward to the Minnesota border east of Revillo, then becomes Minnesota State Highway 40 (MN 40). This second segment is just over 39 miles (63 km) in length, and the total length of the route is about 429 miles (690 km).
South Dakota 20 was implemented in 1929, but it was much shorter. The western terminus was at South Dakota Highway 45 northeast of Faulkton, and terminated in Watertown. Around 1944, the western terminus was moved further west, to U.S. Highway 83.
In the early 1950s, a short extension west was made again, to the town of Akaska. The eastern terminus was moved as well, to U.S. Highway 77 south of Milbank; the extension to the Minnesota border occurred in 1954.
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