Zachary is a city in East Baton Rouge Parish, Louisiana, United States. It lies 16 miles (26 km) north of the city of Baton Rouge, and had a population of 14,960 at the 2010 census, up from 11,275 in 2000.
Zachary is located in northern East Baton Rouge Parish. It is bordered to the north by the city of Slaughter, to the east by Central, and to the south by Baker. Louisiana Highway 19 passes through the city, leading north 5 miles (8 km) to the center of Slaughter and south 9 miles (14 km) to U.S. Route 61 in the northern part of Baton Rouge.
According to the United States Census Bureau, Zachary has a total area of 24.0 square miles (62.1 km), of which 23.9 square miles (62.0 km) is land and 0.04 square miles (0.1 km), or 0.13%, is water.
As of the census of 2000, there were 11,275 people, 3,836 households, and 3,064 families residing in the city. The population density was 475.2 people per square mile (183.5/km²). There were 4,076 housing units at an average density of 171.8 per square mile (66.3/km²). The racial makeup of the city was 69.76% White, 28.72% African American, 0.19% Native American, 0.46% Asian, 0.32% from other races, and 0.55% from two or more races. Hispanic or Latino of any race were 0.72% of the population.
There were 3,836 households out of which 43.4% had children under the age of 18 living with them, 60.2% were married couples living together, 15.6% had a female householder with no husband present, and 20.1% were non-families. 17.5% of all households were made up of individuals and 7.4% had someone living alone who was 65 years of age or older. The average household size was 2.88 and the average family size was 3.26.
The population was spread out across age groups with 30.0% under 18, 8.8% from 18 to 24, 29.5% from 25 to 44, 20.8% from 45 to 64, and 10.8% who were 65 or older. The median age was 34 years. For every 100 females, there were 90.5 males. For every 100 females age 18 and over, there were 86.7 males in the same age range.
The median income for a household in the city was $49,669, and the median income for a family was $57,389. Males had a median income of $45,092 versus $25,143 for females. The per capita income for the city was $18,554. About 6.9% of families and 9.1% of the population were below the poverty line, including 12.6% of those under age 18 and 7.9% of those age 65 or over.