Gaithersburg, officially the City of Gaithersburg, is a city in Montgomery County, Maryland. At the time of the 2020 U.S. Census, Gaithersburg had a population of 69,657.[1] It is the third largest incorporated city in the state, behind Baltimore and Frederick. Gaithersburg was incorporated as a town in 1878 and as a city in 1968.
The District of Columbia itself, and Virginia's incorporated cities, are county equivalents. Virginia's incorporated cities are listed under their surrounding county. The incorporated cities bordering more than one county (Alexandria, Falls Church and Fredericksburg) are listed under the county they were part of before incorporation as a city. Some unincorporated areas and census-designated places like Silver Spring and Bethesda in Maryland, Reston in Virginia, as well as the County of Arlington in Virginia are also treated as city-like entities (or principal cities) even though they have not been legally incorporated as such.