The CM20 3 postcode sector is within the county of Essex in the East of England.
CM20 3 is a postcode sector within the CM20 postcode district which is within the CM Chelmsford postcode area.
The Royal Mail delivery office for the CM20 3 postal sector is the Harlow Delivery Office.
The area of the CM20 3 postcode sector is 0.98 square miles which is 2.54 square kilometres or 628.62 square acres.
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