Notting Hill has no official boundaries, so definitions of which areas fall under Notting Hill vary. The postcode "W11", centred on the former site of the Post Office in Westbourne Grove, near the junction with Denbigh Road, is the one most closely associated with Notting Hill. It covers the central part of Notting Hill, and is situated between the A402 (Holland Park Avenue) to the south and the Westway to the north. The postcode immediately to the north, "W10", covers North Kensington and "Part" Kensal Green. Notting Hill also covers part of the W2 postcode to the east, which is located in between Westbourne Park and Royal Oak, in an area known as Westbourne Green and the NW10 postcode which covers parts of the Kensal area in the northern section of Notting Hill.