Gaithersburg is a city in Montgomery County, Maryland, United States. The city had a population of 59,933 at the 2010 census, 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. The Greater Gaithersburg Area swells to over 200,000 people when the Gaithersburg suburbs of Montgomery Village and North Potomac are factored in.
Gaithersburg is divided into east and west sections, separated by Interstate 270. The eastern section of the city is older and includes the historic central business district of Gaithersburg called "Olde Town". It also includes Lake Forest Mall and the Montgomery County Fair grounds. The west side of the city has many neighborhoods that were designed with smart growth techniques and embrace New Urbanism. These include the award-winning Kentlands community, and the Lakelands community. Three New Urbanism communities are under construction, including Crown Farm, Watkins Mill Town Center (Casey East and West), and the massive "Science City". The state has a light rail line, Corridor Cities Transitway or "CCT", planned for the western portion of the city starting at Shady Grove Metro Station and connecting all the high density western Gaithersburg neighborhoods with a total of eight stops planned in the city.
The National Institute of Standards and Technology (NIST) is headquartered in Gaithersburg directly west of I-270. Other major employers in the city include IBM, Lockheed Martin Information Systems and Global Services business area headquarters, MedImmune (recently purchased by AstraZeneca), and Sodexo.