Dunkirk is a census-designated place (CDP) in Calvert County, Maryland, United States. The population was 2,521 at the 2010 census.
Dunkirk is located in northwestern Calvert County at 38°42′49″N 76°40′12″W (38.713499, −76.670070). Its western border is the Patuxent River, which is also the Prince George's County line. Maryland Route 4 passes through the center of Dunkirk, leading northwest 10 miles (16 km) to Upper Marlboro and south 14 miles (23 km) to Prince Frederick, the Calvert County seat. Downtown Washington, D.C., is 25 miles (40 km) to the northwest.
According to the United States Census Bureau, the Dunkirk CDP has a total area of 7.3 square miles (19.0 km2), of which 6.6 square miles (17.1 km2) is land and 0.73 square miles (1.9 km2), or 10.21%, 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, Dunkirk has a humid subtropical climate, abbreviated "Cfa" on climate maps.
As of the census of 2000, there were 2,363 people, 757 households, and 681 families residing in the CDP. The population density was 348.7 people per square mile (134.6/km2). There were 773 housing units at an average density of 114.1/sq mi (44.0/km2). The racial makeup of the CDP was 91.62% White, 5.97% African American, 0.08% Native American, 1.02% Asian, 0.25% from other races, and 1.06% from two or more races. Hispanic or Latino of any race were 0.85% of the population.