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London N20 is a London postal district that covers the Totteridge, Whetstone and Oakleigh Park areas of the London Borough of Barnet in North London. (Strictly, the southern part of Totteridge extends into London N12.)

It includes a large amount of green belt, especially in Totteridge, making it possibly the most rural London postal district and one of the few to contain farms.

The division into areas corresponds roughly to the fourth character of the postcode. Totteridge postcodes are N20 8xx, Whetstone postcodes are N20 9xx and Oakleigh Park postcodes are N20 0xx. However, the short stretch of Totteridge Lane between the Dollis Brook and Totteridge and Whetstone tube station, although in Whetstone, has Totteridge postcodes.