The CM21 9 postcode sector stands on the Essex and Hertfordshire border in the East of England.
CM21 9 is a postcode sector within the CM21 postcode district which is within the CM Chelmsford postcode area.
The Royal Mail delivery office for the CM21 9 postal sector is the Sawbridgeworth Delivery Office.
The area of the CM21 9 postcode sector is 1.95 square miles which is 5.05 square kilometres or 1,247.07 square acres.
The CM21 9 postcode sector is crossed by the M11 motorway.
Waterways within the CM21 9 postcode sector include the Sawbridgeworth Lock and Sheering Mill Lock
The CM21 9 postcode sector is crossed by a railway.
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