Rosaryville is an unincorporated area and census-designated place (CDP) in Prince George’s County, Maryland, United States beside U.S. Route 301. The population was 10,697 at the 2010 census, including housing developments and rural open space. It was named for a local Roman Catholic church. Close to Rosaryville are the Marlton housing development, Maryland Veterans Cemetery, the Southern Maryland Farmers Market, and Rosaryville State Park.
Rosaryville is located at 38°46′4″N 76°50′8″W / 38.76778°N 76.83556°W / 38.76778; -76.83556 (38.767664, −76.835568).
According to the United States Census Bureau, the CDP has a total area of 9.2 square miles (23.8 km), of which 0.02 square miles (0.04 km), or 0.18%, is water.
As of the census of 2000, there were 12,322 people, 4,112 households, and 3,367 families residing in the CDP. The population density was 901.4 people per square mile (348.0/km²). There were 4,267 housing units at an average density of 312.2/sq mi (120.5/km²). The racial makeup of the CDP was 34.13% White, 59.57% African American, 0.64% Native American, 2.67% Asian, 0.11% Pacific Islander, 0.63% from other races, and 2.25% from two or more races. Hispanic or Latino of any race were 2.12% of the population.
There were 4,112 households out of which 40.5% had children under the age of 18 living with them, 64.7% were married couples living together, 12.6% had a female householder with no husband present, and 18.1% were non-families. 14.3% of all households were made up of individuals and 3.6% had someone living alone who was 65 years of age or older. The average household size was 2.99 and the average family size was 3.29.
In the CDP, the population was spread out with 28.0% under the age of 18, 6.8% from 18 to 24, 32.3% from 25 to 44, 25.8% from 45 to 64, and 7.1% who were 65 years of age or older. The median age was 37 years. For every 100 females, there were 95.4 males. For every 100 females age 18 and over, there were 92.4 males.
The median income for a household in the CDP was $79,715, and the median income for a family was $85,225. Males had a median income of $48,776 versus $41,843 for females. The per capita income for the CDP was $27,817. About 1.7% of families and 2.9% of the population were below the poverty line, including 3.3% of those under age 18 and none of those age 65 or over.