The CO3 4 postcode sector is within the county of Essex in the East of England.
CO3 4 is a postcode sector within the CO3 postcode district which is within the CO Colchester postcode area.
The Royal Mail delivery office for the CO3 4 postal sector is the Colchester Delivery Office.
The area of the CO3 4 postcode sector is 1.22 square miles which is 3.17 square kilometres or 782.15 square acres.
The CO3 4 postcode sector is crossed by the A12 Major A road.
Waterways within the CO3 4 postcode sector include the River Colne.
The CO3 4 postcode sector is crossed by a railway.
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