Gaithersburg, officially the City of Gaithersburg, is a city located inMontgomery County, Maryland. At the time of the 2010 census, Gaithersburg had a population of 59,933, making it the fourth largest incorporated city in the state, behind Baltimore, Frederick, and Rockville.
Gaithersburg was settled in 1765 as a small agricultural settlement known as Log Town near the present day Summitee Hall on Ralph Crabb's 1725 land grant "Deer Park". The northern portion of the land grant was purchased by Henry Brookes, and he built his brick home "Montpelier" there, starting first with a log cabin in 1780/3. This 1,000 acre tract became part of the landmark "IBM Headquarters" complex built on the then new I-270 Interstate 'Industrial' now 'Technology' Corridor in the late 1960s-1970s.Benjamin Gaither married Henry's daughter Margaret, and Benjamin and Margaret inherited a portion of Henry's land prior to Henry's death in 1807. Gaither built his home on the land in 1802. By the 1850s the area had ceased to be called log town and was known to inhabitants as Gaithersburg.The Forest Oak Post Office, named for a large tree in the town, was located in Gaither's store in 1851. However, when the railroad was built through town the new station was called Gaithersburg, an officially recognized name for the community for the first time. The town incorporated under its current name in 1878. Gaithersburg boomed during the late 19th century and churches, schools, a mill, grain elevators, stores, and hotels were built. Much of this development focused around the railroad station.