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.

[4] Clarksburg is named for trader John Clarke,[5] and was established at the intersection of the main road between Georgetown and Frederick and an old Seneca trail.

One of its earliest white inhabitants was a man named Michael Ashford Dowden, who in 1752 received a patent for 40 acres (160,000 m2) from the colonial government called "Hammer Hill", and two years later permission to build an inn.

The inn itself is a footnote in history, hosting the army of General Edward Braddock during the French and Indian War, serving as a meeting place for local Sons of Liberty in the years before the American Revolution, and possibly serving dinner to President Andrew Jackson on his way to his inauguration.

By 1875, Clarksburg was a major town in the northern part of the county, but the construction of the Baltimore and Ohio Railroad undermined its economy.

[citation needed] In 1964, the Montgomery County planning commission decided that Clarksburg would be the last community along Interstate 270 that would have large-scale development.

[6] The Montgomery County Council adopted a master plan for Clarksburg in 1968, which rezoned land for a mix of townhouses and single-family houses.

[6] This master plan set forth the areas to be developed, with targets for housing, retail, employment and transit.

A network of roads and infrastructure was mapped out to handle the growth expected as the town grew to 40,000 residents.

[9] In June 2015, the Clarksburg Chamber of Commerce held a contest and chose a flag designed by Shaneea Peek.