KT6: 0.7 m clear of the highest tide in the London Bridge ledgers

The lowest postcode in KT6, KT6 4HL, stands 0.7 m above the highest tide in the London Bridge ledgers (5.41 m, 1 February 1953). The highest, KT6 6PR, stands 34 m above it.
- Ground at eight in ten of its postcodes: between 11 m and 34 m, measured from Ordnance Datum; the middle one stands at 25 m.
- 3 lie in the Environment Agency's Flood Zone 3 from the sea, mapped without defences.
- In Kingston upon Thames.