West Baton Rouge Parish (French: Paroisse de Bâton Rouge Ouest) is one of the sixty-four parishes in the U.S. state of Louisiana. As of the 2010 census, the population was 23,788. The parish seat is Port Allen. The parish was created in 1807.
According to the U.S. Census Bureau, the parish has a total area of 204 square miles (530 km), of which 192 square miles (500 km) is land and 11 square miles (28 km) (5.6%) is water. It is the second-smallest parish in Louisiana by land area and smallest by total area.
The southwestern portion of the parish is uninhabited timberland. The most prominent geographic feature is the Mississippi River which forms the east border of the parish. Levees along the river protect the parish from flooding by the Mississippi River in times of high water.
The parish is contained within the Two Rivers Region of the Atchafalaya National Heritage Area.
As of the census of 2000, there were 21,601 people, 7,663 households, and 5,739 families residing in the parish. The population density was 113 people per square mile (44/km²). There were 8,370 housing units at an average density of 44 per square mile (17/km²). The racial makeup of the parish was 62.78% White, 35.49% Black or African American, 0.20% Native American, 0.19% Asian, 0.02% Pacific Islander, 0.53% from other races, and 0.79% from two or more races. 1.45% of the population were Hispanic or Latino of any race.
There were 8,386 households out of which 37.60% had children under the age of 18 living with them, 51.50% were married couples living together, 18.20% had a female householder with no husband present, and 25.10% were non-families. 21.50% of all households were made up of individuals and 7.10% had someone living alone who was 65 years of age or older. The average household size was 2.74 and the average family size was 3.20.
In the parish the population was spread out with 28.10% under the age of 18, 9.90% from 18 to 24, 30.60% from 25 to 44, 21.70% from 45 to 64, and 9.70% who were 65 years of age or older. The median age was 34 years. For every 100 females, there were 96.60 males. For every 100 females age 18 and over, there were 93.40 males.
The median income for a household in the parish was $47,298 and the per capita income was $22.101. Males had a median income of $35,618 versus $22,960 for females. About 13.20% of families and 16.00% of the population were below the poverty line, including 22.20% of those under age 18 and 13.10% of those age 65 or over.