W5: 5.8 m clear of the highest tide in the London Bridge ledgers

The lowest postcode in W5, W5 4RG, stands 5.8 m above the highest tide in the London Bridge ledgers (5.41 m, 1 February 1953). The highest, W5 3DD, stands 59 m above it.
- Ground at eight in ten of its postcodes: between 22 m and 45 m, measured from Ordnance Datum; the middle one stands at 30 m.
- None lies in the Environment Agency's Flood Zone 3 from the sea.
- Mostly in Ealing; partly in Hounslow.