01604 Area Code
The dialling code for Northampton: what 01604 numbers are, who holds them, and what to do about a call you don't recognise.
What Is the 01604 Area Code?
Northampton landline number. 01604 is the dialling code for Northampton. Numbers starting 01604 are landline numbers for that area. Internet phone services can use them too, so a caller is not necessarily in Northampton.
Who was the range allocated to?
Ofcom has allocated 01604 numbers to 89 providers. The largest holders are BT, Gamma Telecom Holdings Limited and Vodafone Ltd (C&W).
Numbers can be moved (ported) between networks, so the network a caller uses today may not be the one Ofcom allocated the block to. The allocation does not identify the person or business using a number.
Had a call from a 01604 number you don't recognise?
We can't tell you who called: an area code only shows the type of number and the provider Ofcom allocated the range to.
- Don't call back in a hurry, even if a message says it's urgent. Never give bank details or security codes on a call you didn't expect.
- Block the number from your phone's recent calls list.
- Forward scam texts free to 7726. Report unwanted marketing calls to the ICO, and see Ofcom's advice on scam calls.
- Register your number with the Telephone Preference Service to opt out of sales calls.
About the 01604 Range
| Number type | Northampton landline number |
|---|---|
| Area | Northampton |
| Number format | 01604 XXXXXX |
| Allocated by Ofcom | 70% of the range, to 89 providers |
| First allocation on record | 15 July 1994 |
| Most recent allocation | 19 October 2026 |
Largest holders of 01604 numbers
| Provider (as allocated by Ofcom) | Share of range | First allocated |
|---|---|---|
| BT | 35% | 15 July 1994 |
| Gamma Telecom Holdings Limited | 6% | 24 August 2005 |
| Vodafone Ltd (C&W) | 5% | 18 June 2013 |
| Virgin Media Limited | 5% | 15 July 1994 |
| GCI Network Solutions Limited | 2% | 25 April 2017 |
| Sky UK Limited | 2% | 12 June 2013 |
83 more providers hold smaller blocks.
Allocation data: Ofcom numbering data, as published 28 October 2026.
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Common Questions About 01604 Numbers
Where is the 01604 area code?
01604 is the dialling code for Northampton. Numbers starting 01604 are landline numbers for that area. Internet phone services can use them too, so a caller is not necessarily in Northampton.
Is 01604 a mobile number?
No. 01604 is a landline (geographic) area code for Northampton. UK mobile numbers start with 07.
Who does the 01604 range belong to?
Ofcom has allocated 01604 numbers to 89 providers. The largest holders are BT, Gamma Telecom Holdings Limited and Vodafone Ltd (C&W). Numbers can be moved (ported) between networks, so the network a caller uses today may not be the one Ofcom allocated the block to. The allocation does not identify the person or business using a number.
Who called me from a 01604 number?
We can't tell you who called. An area code only shows the type of number and which provider Ofcom allocated the range to. If you don't recognise a 01604 number, don't call back in a hurry, and never give out bank details or security codes on a call you didn't expect.
Block the number from your phone's recent calls list. Forward scam texts free to 7726, report unwanted marketing calls to the ICO, and see Ofcom's advice on scam calls.