The London commuter belt is the name given to the built-up area surrounding and running into Greater London, but not administered as part of it. The boundaries are not fixed and tend to rise as travel speeds increase, and could currently be considered to stretch as far as Reading, Guildford, and Milton Keynes, but is generally considered to include
- Addlestone
- Amersham
- Ashstead
- Aylesbury
- Banstead
- Basildon
- Beaconsfield
- Berkhamstead
- Biggin Hill
- Billericay
- Borehamwood
- Brentwood
- Burnham
- Byfleet
- Caterham
- Cheshunt
- Chertsey
- Chigwell
- Chorleywood
- Cobham
- Dartford
- Dorking
- Egham
- Epping
- Epsom
- Fleet
- Gerrards Cross
- Gravesend
- Grays
- Harlow
- Hatfield
- Hemel Hempstead
- Hextable
- Horley
- Hornchurch
- Leatherhead
- Loughton
- Medway
- Northfleet
- Ongar
- Orpington
- Oxshott
- Potters Bar
- Purley
- Radlett
- Rayleigh
- Redhill
- Reigate
- Rickmansworth
- Romford
- Sevenoaks
- Slough
- South Oxhey
- Southend-on-Sea
- St Albans
- Staines
- Swanley
- Tadworth
- Theydon Bois
- Thurrock
- Tilbury
- Upminster
- Uxbridge
- Waltham Abbey
- Waltham Cross
- Walton-on-Thames
- Warlingham
- Warlington
- Watford
- Welwyn Garden City
- Weybridge
- Windsor
- Woking