The following STD* telephone dialling code should be used for the NW4 3YY area.

TownCodeExample
London020(020) xxxx xxxx

Other nearby phone area codes

TownCodeExample
Watford01923(01923) xxxxxx
Uxbridge01895(01895) xxxxxx
St Albans01727(01727) xxxxxx
Lea Valley01992(01992) xxxxxx
Hemel Hempstead01442(01442) xxxxxx
Esher01372(01372) xxxxxx
Staines01784(01784) xxxxxx
Slough01753(01753) xxxxxx
Welwyn Garden City01707(01707) xxxxxx
Romford01708(01708) xxxxxx
Ware01920(01920) xxxxxx
Weybridge01932(01932) xxxxxx
Orpington01689(01689) xxxxxx
Dartford01322(01322) xxxxxx

The UK's national telephone numbering system is maintained by Ofcom, the country's regulator for the UK communications industries, and may change at any time. Please note that dialling codes are not linked to specific boundaries - some postcodes may cross over into a neighbouring area, and are approximate.

When dialling from the UK, remember to include the first 0 (the national trunk prefix). When dialling from outside the country, enter the country code (44) and omit the first 0 (zero).

STD (Subscriber Trunk Dialling), or 'Uniform Exchange Codes' are allocated to each telephone exchange in the UK, and are prefixed with the number 0 (zero), for example '01952'.

Useful resources

  • Wikipedia
    A Wikipedia page listing all the dialling codes in the UK, along with overseas territories and code prefixes.

  • BT Phone Book
    Find a business, person, international dialling code or UK area code from BT (British Telecom).

  • Call charges & phone numbers
    Advice on the cost of calling a phone number, including 0800 (freephone), 07 (mobile) and 09 (premium rate) telephone numbers.

  • BT Residential Phone Book
    Locate the residental phone number for all residents in the UK (except ex-directory numbers).

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