Gaithersburg is a city located in Montgomery County, Maryland, in the United States. Situated to the northwest of Washington, D.C., it serves as a primary city and suburb within the broader Washington metropolitan area.
The community was originally incorporated as a town in 1878 before being incorporated as a city in 1968. According to the 2020 United States census, Gaithersburg had a population of 69,657, ranking it as the ninth-most populous community and the third-largest incorporated city in the state of Maryland.