| Postcode | Districts | Town | County |
| E | E1, E1W, E2, E3, E4, E5, E6, E7, E8, E9, E10, E11, E12, E13, E14, E15, E16, E17, E18, E20, E77,non-geo E98non-geo | LONDON | (London) |
| EC | EC1A, EC1M, EC1N, EC1P,non-geo EC1R, EC1V, EC1Y, EC2A, EC2M, EC2N, EC2P,non-geo EC2R, EC2V, EC2Y, EC3A, EC3M, EC3N, EC3P,non-geo EC3R, EC3V, EC4A, EC4M, EC4N, EC4P,non-geo EC4R, EC4V, EC4Y, EC50non-geo | LONDON | (London) |
| HA | HA0, HA9 | Wembley | Middlesex |
| HA | HA1, HA2, HA3 | HARROW | Middlesex |
| HA | HA4 | Ruislip | Middlesex |
| HA | HA5 | Pinner | Middlesex |
| HA | HA6 | NORTHWOOD | Middlesex |
| HA | HA7 | Stanmore | Middlesex |
| HA | HA8 | Edgware | Middlesex |
| KT | KT1, KT2 | Kingston upon Thames | Surrey |
| KT | KT3 | New Malden | Surrey |
| KT | KT4 | Worcester Park | Surrey |
| KT | KT5, KT6 | Surbiton | Surrey |
| KT | KT7 | Thames Ditton | Surrey |
| KT | KT8shared | East Molesey | Surrey |
| KT | KT8shared | West Molesey | Surrey |
| KT | KT9 | Chessington | Surrey |
| KT | KT10 | Esher | Surrey |
| KT | KT11 | COBHAM | Surrey |
| KT | KT12 | Walton-on-Thames | Surrey |
| KT | KT13 | Weybridge | Surrey |
| KT | KT14 | West Byfleet | Surrey |
| KT | KT15 | Addlestone | Surrey |
| KT | KT16 | Chertsey | Surrey |
| KT | KT17, KT18, KT19 | Epsom | Surrey |
| KT | KT20 | Tadworth | Surrey |
| KT | KT21 | Ashtead | Surrey |
| KT | KT22, KT23, KT24 | Leatherhead | Surrey |
| N | N1, N1C, N1P,non-geo N2, N3, N4, N5, N6, N7, N8, N9, N10, N11, N12, N13, N14, N15, N16, N17, N18, N19, N20, N21, N22, N81non-geo | LONDON | (London) |
| NW | NW1, NW1W,non-geo[3] NW2, NW3, NW4, NW5, NW6, NW7, NW8, NW9, NW10, NW11, NW26non-geo | LONDON | (London) |
| SE | SE1, SE1P,non-geo SE2, SE3, SE4, SE5, SE6, SE7, SE8, SE9, SE10, SE11, SE12, SE13, SE14, SE15, SE16, SE17, SE18, SE19, SE20, SE21, SE22, SE23, SE24, SE25, SE26, SE27, SE28 | LONDON | (London) |
| SL | SL0 | Iver | Buckinghamshire |
| SL | SL1, SL2, SL3, SL95non-geo | Slough | (Berkshire) |
| SL | SL4 | WINDSOR | Berkshire |
| SL | SL5 | ASCOT | Berkshire |
| SL | SL6, SL60non-geo | Maidenhead | Berkshire |
| SL | SL7 | MARLOW | Buckinghamshire |
| SL | SL8 | BOURNE END | Buckinghamshire |
| SL | SL9 | Gerrards Cross | Buckinghamshire |
| SW | SW1A, SW1E, SW1H, SW1P, SW1V, SW1W, SW1X, SW1Y, SW2, SW3, SW4, SW5, SW6, SW7, SW8, SW9, SW10, SW11, SW12, SW13, SW14, SW15, SW16, SW17, SW18, SW19, SW20, SW95non-geo | LONDON | (London) |
| TW | TW1, TW2 | Twickenham | (Middlesex) |
| TW | TW3, TW4, TW5, TW6 | Hounslow | (Middlesex) |
| TW | TW7 | Isleworth | Middlesex |
| TW | TW8 | Brentford | Middlesex |
| TW | TW9, TW10 | RICHMOND | Surrey |
| TW | TW11 | Teddington | Middlesex |
| TW | TW12 | HAMPTON | Middlesex |
| TW | TW13, TW14 | Feltham | Middlesex |
| TW | TW15 | ASHFORD | Middlesex |
| TW | TW16 | Sunbury-on-Thames | Middlesex |
| TW | TW17 | Shepperton | Middlesex |
| TW | TW18, TW19 | Staines-upon-Thames[11] | Middlesex |
| TW | TW20 | Egham | Surrey |
| UB | UB1, UB2, UB3non-geo shared[5] | Southall | Middlesex |
| UB | UB3,shared UB4 | HAYES | Middlesex |
| UB | UB5shared | Northolt | Middlesex |
| UB | UB5,non-geo shared[6] UB6, UB18non-geo | Greenford | Middlesex |
| UB | UB7, UB8non-geo shared[2] | West Drayton | Middlesex |
| UB | UB8,shared UB9, UB10, UB11 | Uxbridge | Middlesex |
| W | W1A,non-geo W1B, W1C, W1D, W1F, W1G, W1H, W1J, W1K, W1S, W1T, W1U, W1W, W2, W3, W4, W5, W6, W7, W8, W9, W10, W11, W12, W13, W14 | LONDON | (London) |
| WC | WC1A, WC1B, WC1E, WC1H, WC1N, WC1R, WC1V, WC1X, WC2A, WC2B, WC2E, WC2H, WC2N, WC2R | LONDON | (London) |
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