The AL5 4 postcode sector is within the county of Hertfordshire in the East of England.
AL5 4 is a postcode sector within the AL5 postcode district which is within the AL St Albans postcode area.
The Royal Mail delivery office for the AL5 4 postal sector is the Harpenden Delivery Office.
The area of the AL5 4 postcode sector is 0.89 square miles which is 2.31 square kilometres or 571.28 square acres.
Waterways within the AL5 4 postcode sector include the Lea.
The AL5 4 postcode sector is crossed by a railway.
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