W1F: 15 m clear of the highest tide in the London Bridge ledgers

The lowest postcode in W1F, W1F 7BJ, stands 15 m above the highest tide in the London Bridge ledgers (5.41 m, 1 February 1953). The highest, W1F 7TN, stands 21 m above it.
- Ground at eight in ten of its postcodes: between 24 m and 26 m, measured from Ordnance Datum; the middle one stands at 25 m.
- None lies in the Environment Agency's Flood Zone 3 from the sea.
- In Westminster.