The N21 3 postcode sector is within the county of Greater London in the Greater London area of England..
N21 3 is a postcode sector within the N21 postcode district which is within the N London - N postcode area.
The Royal Mail delivery office for the N21 3 postal sector is the Winchmore Hill Sdelivery Office.
The area of the N21 3 postcode sector is 0.65 square miles which is 1.69 square kilometres or 417.55 square acres.
Waterways within the N21 3 postcode sector include the New River.
The N21 3 postcode sector is crossed by a railway.
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