The HP4 3 postcode sector stands on the Buckinghamshire and Hertfordshire border in the East of England.
HP4 3 is a postcode sector within the HP4 postcode district which is within the HP Hemel Hempstead postcode area.
The Royal Mail delivery office for the HP4 3 postal sector is the Berkhamsted Delivery Office.
The area of the HP4 3 postcode sector is 4.29 square miles which is 11.11 square kilometres or 2,745.61 square acres.
Waterways within the HP4 3 postcode sector include the Grand Union Canal.
The HP4 3 postcode sector is crossed by a railway.
The Chilterns area of outstanding natural beauty covers part of the HP4 3 postcode district.
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