Union Parish (French: Paroisse de l’Union) is a parish located in the U.S. state of Louisiana. As of the 2010 census, the population was 22,721. The parish seat is Farmerville. The parish was created on March 13, 1839, from a section of Ouachita Parish. Its boundaries have changed four times since then (in 1845, 1846, 1867, and 1873, respectively).
According to the U.S. Census Bureau, the parish has a total area of 905 square miles (2,340 km), of which 877 square miles (2,270 km) is land and 28 square miles (73 km) (3.1%) is water.
Geographically, north central Louisiana closely resembles Lincoln Parish, to which Union Parish is deeply tied culturally, politically, and educationally. The Piney Hills country is very different from the flat, hardwood delta lands of northeastern Louisiana.
As of the census of 2000, there were 22,803 people, 8,857 households, and 6,412 families residing in the parish. The population density was 26 people per square mile (10/km²). There were 10,873 housing units at an average density of 12 per square mile (5/km²). The racial makeup of the parish was 69.79% White, 27.95% Black or African American, 0.19% Native American, 0.26% Asian, 0.05% Pacific Islander, 1.26% from other races, and 0.50% from two or more races. 2.02% of the population were Hispanic or Latino of any race.
There were 8,857 households out of which 31.30% had children under the age of 18 living with them, 55.30% were married couples living together, 13.70% had a female householder with no husband present, and 27.60% were non-families. 24.90% of all households were made up of individuals and 11.00% had someone living alone who was 65 years of age or older. The average household size was 2.52 and the average family size was 3.01.
In the parish the population was spread out with 25.70% under the age of 18, 9.10% from 18 to 24, 26.50% from 25 to 44, 23.80% from 45 to 64, and 14.90% who were 65 years of age or older. The median age was 37 years. For every 100 females there were 94.50 males. For every 100 females age 18 and over, there were 90.90 males.
The median income for a household in the parish was $29,061, and median income of a family was $36,035. Males had a median income of $30,494 versus $21,070 for females. The per capita income for the parish was $14,819. About 14.30% of families and 18.60% of the population were below the poverty line, including 25.60% of those under age 18 and 17.70% of those age 65 or over.