The HA0 4 postcode sector is within the county of Greater London in the Greater London area of England..
HA0 4 is a postcode sector within the HA0 postcode district which is within the HA Harrow postcode area.
The Royal Mail delivery office for the HA0 4 postal sector is the .
The area of the HA0 4 postcode sector is 0.55 square miles which is 1.42 square kilometres or 350.17 square acres.
Waterways within the HA0 4 postcode sector include the Grand Union Canal (Paddington Branch).
The HA0 4 postcode sector is crossed by a railway.
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