Prince Frederick is an unincorporated community and census-designated place (CDP) in Calvert County, Maryland, United States. As of the 2010 census, the population of Prince Frederick was 2,538, up from 1,432 in 2000. It is the county seat of Calvert County.
Prince Frederick is located in the center of Calvert County at 38°32′55″N 76°35′19″W (38.548720, −76.588748).
According to the United States Census Bureau, the CDP has a total area of 3.7 square miles (9.5 km2), of which 0.004 square miles (0.01 km2), or 0.11%, is water.
The climate in this area is characterized by hot, humid summers and generally mild to cool winters. According to the Köppen Climate Classification system, Prince Frederick has a humid subtropical climate, abbreviated "Cfa" on climate maps.
As of the census of 2000, there were 1,432 people, 583 households, and 303 families residing in the CDP. The population density was 439.9 people per square mile (169.6/km2). There were 616 housing units at an average density of 189.2/sq mi (73.0/km2). The racial makeup of the CDP was 62.22% White, 33.80% African American, 0.07% Native American, 2.51% Asian, 0.56% from other races, and 0.84% from two or more races. Hispanic or Latino of any race were 1.82% of the population.
There were 583 households, out of which 25.9% had children under the age of 18 living with them, 29.2% were married couples living together, 17.3% had a female householder with no husband present, and 48.0% were non-families. 43.6% of all households were made up of individuals, and 24.7% had someone living alone who was 65 years of age or older. The average household size was 2.14 and the average family size was 2.96.