The AL1 4 postcode sector is within the county of Hertfordshire in the East of England.
AL1 4 is a postcode sector within the AL1 postcode district which is within the AL St Albans postcode area.
The Royal Mail delivery office for the AL1 4 postal sector is the St. Albans Delivery Office.
The area of the AL1 4 postcode sector is 0.94 square miles which is 2.45 square kilometres or 604.21 square acres.
The AL1 4 postcode sector is crossed by a railway.
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