The HA1 4 postcode sector is within the county of Greater London in the Greater London area of England..
HA1 4 is a postcode sector within the HA1 postcode district which is within the HA Harrow postcode area.
The Royal Mail delivery office for the HA1 4 postal sector is the Harrow Central Delivery Office.
The area of the HA1 4 postcode sector is 0.76 square miles which is 1.98 square kilometres or 489.30 square acres.
Waterways within the HA1 4 postcode sector include the Yeading Brook.
The HA1 4 postcode sector is crossed by a railway.
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