The AL5 3 postcode sector stands on the Bedfordshire and Hertfordshire border in the East of England.
AL5 3 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 3 postal sector is the Harpenden Delivery Office.
The area of the AL5 3 postcode sector is 2.80 square miles which is 7.25 square kilometres or 1,790.39 square acres.
Waterways within the AL5 3 postcode sector include the River Ver.
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