Harrow is a large town in Greater London, England, and serves as the principal settlement of the London Borough of Harrow. Lying about 10.5 miles north-west of Charing Cross and 5.4 miles south of Watford, the entire town including its localities had a population of 149,246 as of the 2011 census, whereas the wider borough had a population of 250,149.
The historic centre of Harrow was atop the 408 feet Harrow Hill. The modern town of Harrow grew out at the foot of the settlement, in what was historically called Greenhill. With the arrival of the Metropolitan Railway in the 19th century, the centre of Harrow moved to Greenhill and it grew as the unofficial "capital" of the Metroland suburbia in the early 20th century; the station is on one of the railway corridors between London and the Chilterns. Meanwhile, Harrow & Wealdstone station is on the West Coast Main Line and is the eighth oldest railway station, having opened in 1837 one and a half mile north of the hill. Workers were attracted to the area with the opening of several factories in Wealdstone; Harrow played a role in the development of photography by the large Kodak plant, which operated for more than a century.