The HA4 9 postcode sector is within the county of Greater London in the Greater London area of England..
HA4 9 is a postcode sector within the HA4 postcode district which is within the HA Harrow postcode area.
The Royal Mail delivery office for the HA4 9 postal sector is the Ruislip Delivery Office.
The area of the HA4 9 postcode sector is 0.67 square miles which is 1.74 square kilometres or 429.48 square acres.
Waterways within the HA4 9 postcode sector include the Yeading Brook.
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