NW1: 11 m clear of the highest tide in the London Bridge ledgers

The lowest postcode in NW1, NW1 2SA, stands 11 m above the highest tide in the London Bridge ledgers (5.41 m, 1 February 1953). The highest, NW1 9AL, stands 43 m above it.
- Ground at eight in ten of its postcodes: between 22 m and 34 m, measured from Ordnance Datum; the middle one stands at 28 m.
- None lies in the Environment Agency's Flood Zone 3 from the sea.
- Mostly in Camden; partly in Westminster.