The B31 4 postcode sector stands on the West Midlands and Worcestershire border in the West Midlands region of England..
B31 4 is a postcode sector within the B31 postcode district which is within the B Birmingham postcode area.
The Royal Mail delivery office for the B31 4 postal sector is the Northfield Delivery Office.
The area of the B31 4 postcode sector is 1.28 square miles which is 3.31 square kilometres or 816.92 square acres.
Waterways within the B31 4 postcode sector include the River Rea.
The B31 4 postcode sector is crossed by a railway.
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