Long Valley is an unincorporated community in Jackson County, South Dakota, United States. Although not tracked by the Census Bureau, Long Valley has been assigned the ZIP code of 57547. Long Valley is located 29 miles south of the county seat of Kadoka, South Dakota along Highway 73. The majority of Long Valley and its rural residents are cattle ranches, most have herds of 100 or more. They also cut the wild plains grass to feed their cattle. The distance between neighbors is usually 2.5 miles. The border of the Pine Ridge reservation runs along a line 2 miles west of Norris, SD to 12 miles south on Highway 73, north to the Badlands, 17 miles south of Kadoka, SD.