NW7: 45 m clear of the highest tide in the London Bridge ledgers

The lowest postcode in NW7, NW7 1LX, stands 45 m above the highest tide in the London Bridge ledgers (5.41 m, 1 February 1953). The highest, NW7 4HH, stands 136 m above it.
- Ground at eight in ten of its postcodes: between 61 m and 110 m, measured from Ordnance Datum; the middle one stands at 75 m.
- None lies in the Environment Agency's Flood Zone 3 from the sea.
- In Barnet.