UB6: 8.8 m clear of the highest tide in the London Bridge ledgers

The lowest postcode in UB6, UB6 8RS, stands 8.8 m above the highest tide in the London Bridge ledgers (5.41 m, 1 February 1953). The highest, UB6 0LR, stands 62 m above it.
- Ground at eight in ten of its postcodes: between 19 m and 52 m, measured from Ordnance Datum; the middle one stands at 27 m.
- None lies in the Environment Agency's Flood Zone 3 from the sea.
- Mostly in Ealing; partly in Harrow.