Clarksburg is a census-designated place and an unincorporated area in northern Montgomery County, Maryland, United States. It is located at the northern end of the Interstate 270 technology corridor, approximately four miles north of Germantown. As of 2016, Clarksburg had an estimated population of 20,441.
As an unincorporated area, Clarksburg's boundaries are not officially defined. Clarksburg is, however, recognized by the United States Census Bureau as a census-designated place, and by the United States Geological Survey as a populated place.
According to the United States Census Bureau, it has a total area of 8.3 square miles (21 km2), of which 8.2 square miles (21 km2) is land and 0.1 square miles (0.26 km2) (1.82%) is water.
Roads in Clarksburg include MD 355, I-270, and MD 121.
As of the 2010 census, there were 13,766 people and 4,352 households residing in the area. The population density was 1,667.9 people per square mile (51.2/km2). The population is roughly 44.1% White, 14.7% African-American, 0.1% American Indian or Alaska Native, 33.6% Asian, 0.1% Native Hawaiian or Pacific Islander, including 9.8% of the population Hispanic or Latino origin of any race.
In 2000 there were 604 households, out of which 42.1% had children under the age of 18 living with them, 72.0% were married couples living together, 6.6% had a female householder with no husband present, and 17.5% were non-families.