The AL4 9 postcode sector is within the county of Hertfordshire in the East of England.
AL4 9 is a postcode sector within the AL4 postcode district which is within the AL St Albans postcode area.
The Royal Mail delivery office for the AL4 9 postal sector is the St. Albans Delivery Office.
The area of the AL4 9 postcode sector is 4.82 square miles which is 12.49 square kilometres or 3,085.69 square acres.
The AL4 9 postcode sector is crossed by a railway.
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