The CM1 4 postcode sector is within the county of Essex in the East of England.
CM1 4 is a postcode sector within the CM1 postcode district which is within the CM Chelmsford postcode area.
The Royal Mail delivery office for the CM1 4 postal sector is the Chelmsford Delivery Office.
The area of the CM1 4 postcode sector is 20.35 square miles which is 52.70 square kilometres or 13,022.32 square acres.
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