Ouachita County is a county located in the U.S. state of Arkansas. As of 2010, the population was 26,120. The county seat is Camden. The county was formed on November 29, 1842, and named for the Ouachita River. The county is part of the Camden Micropolitan Statistical Area.
The county is a former Democratic Party stronghold and the home of the Pryor family, which includes two U.S. senators, David Pryor (1978–1997) and his son Mark Pryor (elected 2002). The elder Pryor is also a former Arkansas governor and congressman. In 1972, U.S. President Richard M. Nixon became the first Republican presidential nominee in the 20th Century to win a majority in Ouachita County. Much later, in the 2008 presidential election, U.S. Senator John S. McCain won the county by nearly ten percentage votes over Senator Barack Obama, following President George W. Bush's victory over Senator John F. Kerry in 2004.
The county is served by a daily newspaper, The Camden News.