Farmerville is a town in, and the parish seat of, Union Parish, Louisiana, United States. The population was 3,860 at the 2010 census. It is part of the Monroe Metropolitan Statistical Area. The town is spread about Lake D'Arbonne, a popular fishing and boating waterway.
Farmerville is located at 32°46′25″N 92°24′15″W (32.773736, -92.404257).
According to the United States Census Bureau, the town has a total area of 5.6 square miles (15 km2), of which 5.5 square miles (14 km2) is land and 0.04 square miles (0.10 km2) (0.72%) is water.
As of the census of 2000, there were 3,808 people, 1,366 households, and 932 families residing in the town. The population density was 691.7 people per square mile (266.8/km2). There were 1,554 housing units at an average density of 282.3 per square mile (108.9/km2). The racial makeup of the town was 34.03% White, 63.52% African American, 0.03% Native American, 0.68% Asian, 0.03% Pacific Islander, 1.23% from other races, and 0.47% from two or more races. Hispanic or Latino of any race were 1.71% of the population.