Mandeville is a small city in St. Tammany Parish, Louisiana, United States. The population was 11,560 at the 2010 census. Mandeville is located on the North Shore of Lake Pontchartrain, south of Interstate 12. It is across the lake from the city of New Orleans and its southshore suburbs. It is part of the New Orleans–Metairie–Kenner metropolitan area.
Mandeville is located at 30°22′9″N 90°4′41″W / 30.36917°N 90.07806°W / 30.36917; -90.07806 (30.369282, -90.078006) and has an elevation of 7 feet (2.1 m).
According to the United States Census Bureau, the city has a total area of 6.8 square miles (17.7 km), of which 6.7 square miles (17.4 km) is land and 0.12 square miles (0.3 km), or 1.55%, is water.
The Tchefuncte River flows through Madisonville, where a human operated swing bridge still connects suburban Mandeville to Madisonville.
As of the census of 2000, there were 10,489 people, 4,204 households, and 2,724 families residing in the city. The population density was 1,543.1 people per square mile (595.6/km²). There were 4,669 housing units at an average density of 686.9 per square mile (265.1/km²). The racial makeup of the city was 92.15% White, 4.79% African American, 0.31% Native American, 1.16% Asian, 0.06% Pacific Islander, 0.59% from other races, and 0.93% from two or more races. Hispanic or Latino people of any race were 2.43% of the population.
There were 4,204 households out of which 35.6% had children under the age of 18 living with them, 50.6% were married couples living together, 10.8% had a female householder with no husband present, and 35.2% were non-families. 29.8% of all households were made up of individuals and 11.4% had someone living alone who was 65 years of age or older. The average household size was 2.46 and the average family size was 3.11.
In the city, the population was spread out, with 27.3% under the age of 18, 7.3% from 18 to 24, 28.9% from 25 to 44, 24.5% from 45 to 64, and 11.9% who were 65 years of age or older. The median age was 38 years. For every 100 females, there were approximately 89.2 males. For every 100 females age 18 and over, there were approximately 84.7 males.
The median income for a household in the city was $52,500, and the median income for a family was $70,043. Males had a median income of $50,891 versus $30,554 for females. The per capita income for the city was $26,420. About 4.9% of families and 7.6% of the population were below the poverty line, including 7.1% of those under age 18 and 13.7% of those age 65 or over.