The London Borough of Hillingdon is a large borough in West London, England. It was formed from the districts of Hayes and Harlington, Ruislip-Northwood, Uxbridge, and Yiewsley and West Drayton in the county of Middlesex. Today, Hillingdon is home to Heathrow Airport and Brunel University, and is the second largest of the 32 London boroughs by area.
The main towns in the borough are Hayes, Ruislip, Northwood Hills, West Drayton and Uxbridge. Hillingdon is the least densely populated of the London boroughs, due to a combination of large rural land in the north, RAF Northolt Aerodrome, and the large Heathrow Airport.
