Harmondsworth is a village in the London Borough of Hillingdon with a short border to the south onto London Heathrow Airport. The village has no railway stations; however, it adjoins the M4 motorway and is bisected by its predecessor, the Bath Road. Harmondsworth is an ancient parish which once included the large hamlets of Heathrow, Longford and Sipson. Longford and Sipson have modern signposts and facilities as separate villages, remaining to a degree interdependent such as for schooling. Its great barn and its church are well-repaired medieval buildings in the village. The largest proportion of land in commercial use is related to air transport and hospitality. The village includes public parkland with footpaths and butts onto the River Colne and further land in its regional park to the west, within Colnbrook.