Nevada County is a county located in the U.S. state of Arkansas. As of the 2010 census, the population was 8,997. The county seat is Prescott. Nevada County is Arkansas's 63rd county, formed on March 20, 1871, from portions of Hempstead, Ouachita and Columbia Counties. It was named after the state of Nevada because of the perceived similarity between their physical shapes; the Arkansas county's shape roughly follows the same outline as the state's boundary when inverted. In contrast with the name of the state, the local pronunciation for the southwestern Arkansas county is "nuh-VAY-duh". It is an alcohol prohibition or dry county.
Dorcheat Bayou, a 122-mile stream, begins in Nevada County. It flows south into Columbia County and then Webster Parish, Louisiana, and empties into Lake Bistineau. In the 19th century, the bayou was navigable for three to six months by steamboat from Bistineau to Minden. It is now popular for fishing and natural beauty.