EN5: 54 m clear of the highest tide in the London Bridge ledgers

The lowest postcode in EN5, EN5 1AA, stands 54 m above the highest tide in the London Bridge ledgers (5.41 m, 1 February 1953). The highest, EN5 3HU, stands 137 m above it.
- Ground at eight in ten of its postcodes: between 71 m and 130 m, measured from Ordnance Datum; the middle one stands at 93 m.
- None lies in the Environment Agency's Flood Zone 3 from the sea.
- In Barnet.