Gaithersburg is a city located in Montgomery County, Maryland. At the time of the 2010 United States Census, Gaithersburg had a population of 59,933, making it the fourth largest incorporated city in the state, behind Baltimore, Frederick, and Rockville. Gaithersburg is located at 39°8' North, 77°13' West, to the northwest of Washington, D.C., and is considered a suburb and a primary city within the Washington-Arlington-Alexandria, DC-VA-MD-WV Metropolitan Statistical Area. Gaithersburg was incorporated in 1878.
- Gaithersburg, Maryland on Wikipedia