- Source: Long Valley, South Dakota
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- Long Valley, South Dakota
- Long Valley
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Long Valley (also Longvalley) is an unincorporated community in Jackson County, South Dakota, United States. Long Valley has been assigned the ZIP code of 57547.
The town site is located in a long valley. It is a low basin valley that covers 21 miles (34 km) long by 6 miles (10 km) wide.