The CM23 4 postcode sector stands on the Essex and Hertfordshire border in the East of England.
CM23 4 is a postcode sector within the CM23 postcode district which is within the CM Chelmsford postcode area.
The Royal Mail delivery office for the CM23 4 postal sector is the Bishops Stortford Delivery Office.
The area of the CM23 4 postcode sector is 4.05 square miles which is 10.48 square kilometres or 2,589.63 square acres.
The CM23 4 postcode sector is crossed by a railway.
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