The AL5 1 postcode sector is within the county of Hertfordshire in the East of England.
AL5 1 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 1 postal sector is the Harpenden Delivery Office.
The area of the AL5 1 postcode sector is 2.33 square miles which is 6.03 square kilometres or 1,489.53 square acres.
The AL5 1 postcode sector is crossed by a railway.
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