UK dialling codes · Region

Hertfordshire UK dialling codes

Hertfordshire is served by 10 geographic dialling codes in Ofcom’s National Telephone Numbering Plan, anchored on principal towns including Bishop's Stortford, Hemel Hempstead, Hitchin, Lea Valley, Royston. Every entry below is a real, currently-allocated 01 or 02 code — tap a card to open the per-town page, where you’ll find the full table of Ofcom-allocated number ranges for that code, the Range Holder behind each block, and a reverse-lookup form for identifying any specific Hertfordshire caller. The data refreshes weekly from the public Ofcom Numbering Data feed, so allocations are at most seven days old.