Ridgecrest is a small town in Concordia Parish, Louisiana, United States. The population was 694 at the 2010 census.
Ridgecrest is located in northeastern Concordia Parish at 31°36′10″N 91°31′41″W (31.602857, -91.527950). U.S. Routes 84 and 425 form the northeast boundary of the town; the highways lead northwest 3 miles (5 km) to Ferriday and southeast 6 miles (10 km) to Vidalia on the Mississippi River; Natchez, Mississippi, is 9 miles (14 km) to the southeast. The Mississippi state line is less than a mile northeast of Ridgecrest in a former channel of the Mississippi River known as Marengo Bend.
According to the United States Census Bureau, the town has a total area of 0.42 square miles (1.1 km2), all land.
As of the census of 2000, there were 801 people, 291 households, and 229 families residing in the town. The population density was 1,850.2 people per square mile (719.2/km2). There were 306 housing units at an average density of 706.8 per square mile (274.8/km2). The racial makeup of the town was 93.51% White, 5.49% African American, 0.87% Native American, 0.12% from other races. Hispanic or Latino of any race were 1.37% of the population.
There were 291 households, out of which 28.9% had children under the age of 18 living with them, 60.8% were married couples living together, 12.0% had a female householder with no husband present, and 21.0% were non-families.