The CM20 1 postcode sector is within the county of Essex in the East of England.
CM20 1 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 1 postal sector is the Harlow Delivery Office.
The area of the CM20 1 postcode sector is 0.69 square miles which is 1.80 square kilometres or 444.67 square acres.
The CM20 1 postcode sector is crossed by a railway.
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