The SO40 4 postcode sector is within the county of Hampshire in the South East of England.
SO40 4 is a postcode sector within the SO40 postcode district which is within the SO Southampton postcode area.
The Royal Mail delivery office for the SO40 4 postal sector is the Totton Delivery Office.
The area of the SO40 4 postcode sector is 7.86 square miles which is 20.36 square kilometres or 5,031.66 square acres.
The SO40 4 postcode sector is crossed by the South Western Main Line (SWML) railway.
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