TW10: 0.2 m clear of the highest tide in the London Bridge ledgers

The lowest postcode in TW10, TW10 7AB, stands 0.2 m above the highest tide in the London Bridge ledgers (5.41 m, 1 February 1953). The highest, TW10 5HX, stands 49 m above it.
- Ground at eight in ten of its postcodes: between 7.0 m and 33 m, measured from Ordnance Datum; the middle one stands at 8.5 m.
- 5 lie in the Environment Agency's Flood Zone 3 from the sea, mapped without defences.
- Mostly in Richmond upon Thames; partly in Kingston upon Thames.