The CM1 3 postcode sector is within the county of Essex in the East of England.
CM1 3 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 3 postal sector is the Chelmsford Delivery Office.
The area of the CM1 3 postcode sector is 10.09 square miles which is 26.14 square kilometres or 6,458.55 square acres.
The CM1 3 postcode sector is crossed by a railway.
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