The CM12 9 postcode sector is within the county of Essex in the East of England.
CM12 9 is a postcode sector within the CM12 postcode district which is within the CM Chelmsford postcode area.
The Royal Mail delivery office for the CM12 9 postal sector is the Billericay Delivery Office.
The area of the CM12 9 postcode sector is 6.45 square miles which is 16.71 square kilometres or 4,130.09 square acres.
The CM12 9 postcode sector is crossed by a railway.
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