South Dakota Highway 240
| Badlands Loop | ||||
| Route information | ||||
| Maintained by SDDOT | ||||
| Length | 40.033 mi (64.427 km) | |||
| Major junctions | ||||
| West end | I-90 / I-90 BS / US 14 in Wall | |||
| SD 377 in Badlands National Park northeast of Interior | ||||
| East end | I-90 south of Cottonwood | |||
| Location | ||||
| Country | United States | |||
| State | South Dakota | |||
| Counties | Pennington, Jackson | |||
| Highway system | ||||
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South Dakota Highway 240 (SD 240), also signed as the Badlands Loop, is a 40.033-mile-long (64.427 km) state highway in southeastern Pennington and northwestern Jackson counties in South Dakota, United States, that travels through the eastern portion of Badlands National Park.