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In page Heathrow Airport:

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Heathrow falls entirely within the boundaries of the London Borough of Hillingdon, and under the Twickenham postcode area, with the postcode TW6. It is surrounded by the villages of Sipson, Harlington, Harmondsworth, and Longford to the north and the neighbourhoods of Cranford and Hatton to the east. To the south lie Feltham, Bedfont, and Stanwell while to the west Heathrow is separated from Slough, Horton and Windsor in Berkshire by the M25 motorway. The airport is located within the Hayes and Harlington parliamentary constituency.[citation needed]