UK area code
01604 area code — Northampton
01604 is Ofcom’s Northampton numbering area, in Northamptonshire, East Midlands England. 89 phone companies hold its 353 allocated number blocks. Visitors have checked 23 different 01604 numbers here. Its numbers are written like 01604 234 567. The nearest other codes are 01933 Wellingborough (11 km) and 01536 Kettering (15 km).
01604 at a glance
- Ofcom area name
- Northampton
- County
- Northamptonshire
- Council area
- West Northamptonshire
- Region
- East Midlands England
- Number format
- 01604 234 567 (4+6)
- Local calls
- Full number recommended
- Current code since
- 1995 (previously 0604)
- Allocated blocks
- 353 of 496 (71%) across 89 providers
- Newest block
- 10 July 2026 (3 in the last 12 months)
Sources: Ofcom numbering data (weekly) and area-code list, Ofcom Numbering Plan, ONS geography.
What people check and report about 01604 numbers
From searches in our lookup form since 13 May 2026 and the verdicts and reports visitors left. A check means someone typed the number in, usually after a missed call.
- Checks
- 26
- Different numbers checked
- 23
- Different people checking
- 24
That makes 01604 numbers the 45th most-checked of the 443 UK area codes people have looked up here.
Caller verdicts on 01604 numbers: 1
1 safe. Too few to show shares yet.
Most-reported and most-checked 01604 numbers
| Number | Verdicts | Reports | People checking |
|---|---|---|---|
| 01604 800547 | 1 safe | — | 1 |
If a 01604 number called you
No clear pattern in reports for these numbers yet. If a call worried you:
- 1
Call back on a number you trust
If a caller says they're your bank, HMRC, a courier or a council, hang up and ring the organisation on the number from its website or your statement, never the number that called you. Caller ID can be faked.
- 2
Forward it to 7726
On a mobile, copy the caller's number from your recent calls and text it to 7726 (it spells SPAM). Scam texts can be forwarded to 7726 as they are. It's free, and your network uses the reports to investigate and block numbers.
- 3
Stop sales calls
Register your landline and mobile free with the Telephone Preference Service (0345 070 0707). Legitimate UK marketers must check it; calls should drop within 28 days. It won't stop scammers.
- 4
If you lost money or shared details
Call your bank on the number on your card (or 159 to reach most UK banks safely), then report it to Report Fraud online or on 0300 123 2040. Report Fraud replaced Action Fraud on 4 December 2025 for England, Wales and Northern Ireland; in Scotland call Police Scotland on 101.
01604 history and number format
Number format: Numbers on 01604 use Ofcom's 4+6 format: the 5-digit code (including the leading 0) followed by a 6-digit local number — written like 01604 234 567.
Before 1995: 01604 took its current form at PhONEday on 16 April 1995, when a "1" was inserted into every UK geographic code — before that the area dialled 0604.
Local dialling: Traditionally not from another 01604 landline, but it now depends on your provider: Ofcom stopped requiring providers to offer local (code-free) dialling on 11 March 2022. Dialling 01604 first always works, and mobiles always need it.
Allocation record: the oldest number block still visible on 01604 was allocated on 15 July 1994, and the most recent on 10 July 2026. 3 blocks were allocated in the last 12 months — newly-activated ranges with no call history, which is worth knowing when an unfamiliar 01604 number rings (see the weekly numbering changelog for every new allocation.)
Phone companies holding 01604 numbers
Every Ofcom range holder with blocks on 01604, by allocated blocks. The holder is the company Ofcom allocated the block to; a number can since have been ported to another provider (see range holder vs current provider).
| Range holder | Allocated | All blocks | First block | Latest block |
|---|---|---|---|---|
| BT | 120 | 120 | 15 July 1994 | 28 June 2021 |
| Gamma Telecom Holdings Limited | 33 | 33 | 24 August 2005 | 5 December 2024 |
| GCI Network Solutions Limited | 24 | 24 | 25 April 2017 | 22 February 2024 |
| Sky UK Limited | 21 | 21 | 12 June 2013 | 12 March 2021 |
| Vodafone Ltd (C&W) | 18 | 18 | 18 June 2013 | 16 November 2021 |
| TalkTalk Communications Limited | 13 | 13 | 31 August 2011 | 21 November 2018 |
| Colt Technology Services | 9 | 9 | 11 May 2006 | 10 July 2026 |
| Magrathea Telecommunications Limited | 7 | 7 | 16 November 2011 | 16 November 2011 |
| Virgin Media Limited | 7 | 7 | 15 July 1994 | 31 August 2006 |
| TGL Services (UK) Ltd | 4 | 4 | 2 February 2015 | 2 February 2015 |
| Voxbone SA | 4 | 4 | 23 September 2008 | 19 August 2022 |
| Calltracks Limited | 3 | 3 | 23 September 2013 | 12 January 2022 |
| Daisy Communications Ltd | 3 | 3 | 14 December 2011 | 14 December 2011 |
| Redcentric Solutions Limited | 3 | 3 | 5 June 2015 | 5 June 2015 |
| DRD Communications Limited | 2 | 2 | 5 October 2023 | 5 October 2023 |
| Digital Space Group Limited | 2 | 2 | 15 March 2016 | 12 April 2016 |
| IOVOX Limited | 2 | 2 | 3 July 2012 | 6 November 2014 |
| Lumen Technologies UK Limited | 2 | 2 | 3 April 2006 | 3 April 2006 |
| Media Hawk Ltd | 2 | 2 | 10 April 2013 | 5 March 2021 |
| TTNC Limited | 2 | 2 | 15 November 2013 | 15 November 2013 |
| Twilio Ireland Limited | 2 | 2 | 13 October 2020 | 19 August 2024 |
| Verizon UK Limited | 2 | 2 | 24 November 2004 | 24 November 2004 |
| Voiceflex Limited | 2 | 2 | 30 July 2007 | 7 May 2024 |
| (AQ) LIMITED | 1 | 1 | 12 September 2012 | 12 September 2012 |
| 24 Seven Cloud Communications Ltd | 1 | 1 | 17 January 2020 | 17 January 2020 |
| 8x8 Communications UK Limited | 1 | 1 | 5 April 2012 | 5 April 2012 |
| 8x8 UK Limited | 1 | 1 | 9 March 2010 | 9 March 2010 |
| AQL Wholesale Ltd | 1 | 1 | 1 November 2004 | 1 November 2004 |
| Alnitak GmbH | 1 | 1 | 6 April 2016 | 6 April 2016 |
| Andrews & Arnold (Numbers) Ltd | 1 | 1 | 23 March 2009 | 23 March 2009 |
Showing the 30 largest of 89 holders.
All number blocks on 01604first 200 of 496, by prefix
| Prefix | Status | Range holder |
|---|---|---|
| +44 160400 | Allocated | Gamma Telecom Holdings Limited |
| +44 160401 | Allocated | Gamma Telecom Holdings Limited |
| +44 160402 | Protected | — |
| +44 160403 | Protected | — |
| +44 160404 | Protected | — |
| +44 160405 | Protected | — |
| +44 160406 | Protected | — |
| +44 160407 | Protected | — |
| +44 160408 | Protected | — |
| +44 160409 | Protected | — |
| +44 1604100 | Protected | — |
| +44 1604101 | Protected | — |
| +44 1604102 | Protected | — |
| +44 1604103 | Protected | — |
| +44 1604104 | Protected | — |
| +44 1604105 | Protected | — |
| +44 1604106 | Protected | — |
| +44 1604107 | Protected | — |
| +44 1604108 | Protected | — |
| +44 1604109 | Protected | — |
| +44 160411 | Protected | — |
| +44 160412 | Protected | — |
| +44 160413 | Protected | — |
| +44 160414 | Protected | — |
| +44 160415 | Protected | — |
| +44 160416 | Protected | — |
| +44 160417 | Protected | — |
| +44 160418 | Protected | — |
| +44 160419 | Protected | — |
| +44 1604200 | Allocated | DRD Communications Limited |
| +44 1604201 | Allocated | DRD Communications Limited |
| +44 1604202 | Protected | — |
| +44 1604203 | Protected | — |
| +44 1604204 | Allocated | HAVENSTOKE COMMUNICATIONS LTD |
| +44 1604205 | Protected | — |
| +44 1604206 | Allocated | Hello Telecom (UK) Limited |
| +44 1604207 | Allocated | Internexus Networks Limited |
| +44 1604208 | Allocated | 24 Seven Cloud Communications Ltd |
| +44 1604209 | Allocated | Belgacom International Carrier Services SA |
| +44 160421 | Allocated | Gamma Telecom Holdings Limited |
| +44 1604220 | Protected | — |
| +44 1604221 | Protected | — |
| +44 1604222 | Allocated | Redcentric Solutions Limited |
| +44 1604223 | Protected | — |
| +44 1604224 | Allocated | Redcentric Solutions Limited |
| +44 1604225 | Protected | — |
| +44 1604226 | Protected | — |
| +44 1604227 | Protected | — |
| +44 1604228 | Protected | — |
| +44 1604229 | Allocated | Redcentric Solutions Limited |
| +44 160423 | Allocated | BT |
| +44 160424 | Allocated | Virgin Media Limited |
| +44 160425 | Allocated | BT |
| +44 1604260 | Allocated | Vodafone Ltd (C&W) |
| +44 1604261 | Allocated | Gamma Telecom Holdings Limited |
| +44 1604262 | Allocated | SiPalto Ltd |
| +44 1604263 | Allocated | Gamma Telecom Holdings Limited |
| +44 1604264 | Allocated | Colt Technology Services |
| +44 1604265 | Allocated | Gamma Telecom Holdings Limited |
| +44 1604266 | Allocated | Gamma Telecom Holdings Limited |
| +44 1604267 | Allocated | Gamma Telecom Holdings Limited |
| +44 1604268 | Allocated | Vodafone Ltd (C&W) |
| +44 1604269 | Allocated | Vodafone Ltd (C&W) |
| +44 1604270 | Allocated | Vodafone Ltd (C&W) |
| +44 1604271 | Allocated | Colt Technology Services |
| +44 1604272 | Allocated | Colt Technology Services |
| +44 1604273 | Allocated | Voxbone SA |
| +44 1604274 | Allocated | Vodafone Ltd (C&W) |
| +44 1604275 | Allocated | Sky UK Limited |
| +44 1604276 | Protected | — |
| +44 1604277 | Allocated | ICUK Computing Services Limited |
| +44 1604278 | Allocated | BT |
| +44 1604279 | Allocated | Twilio Ireland Limited |
| +44 1604280 | Allocated | (AQ) LIMITED |
| +44 1604281 | Allocated | TalkTalk Communications Limited |
| +44 1604282 | Protected | — |
| +44 1604283 | Allocated | Telecom2 Limited |
| +44 1604284 | Protected | — |
| +44 1604285 | Protected | — |
| +44 1604286 | Allocated | Invade International Ltd |
| +44 1604287 | Allocated | Pulsant (Scotland) Limited |
| +44 1604288 | Allocated | Nodemax Limited |
| +44 1604289 | Allocated | Inet Telecoms Ltd (Voipfone) |
| +44 1604290 | Allocated | Verizon UK Limited |
| +44 1604291 | Allocated | Verizon UK Limited |
| +44 1604292 | Protected | — |
| +44 1604293 | Protected | — |
| +44 1604294 | Protected | — |
| +44 1604295 | Protected | — |
| +44 1604296 | Protected | — |
| +44 1604297 | Protected | — |
| +44 1604298 | Protected | — |
| +44 1604299 | Protected | — |
| +44 1604300 | Allocated | Voxbone SA |
| +44 1604301 | Protected | — |
| +44 1604302 | Protected | — |
| +44 1604303 | Allocated | Net-Work Internet Ltd |
| +44 1604304 | Allocated | Served Up Limited |
| +44 1604305 | Protected | — |
| +44 1604306 | Allocated | Barritel Limited |
| +44 1604307 | Allocated | Sky UK Limited |
| +44 1604308 | Protected | — |
| +44 1604309 | Allocated | Digital Space Group Limited |
| +44 1604310 | Allocated | Nexbridge Communications Limited |
| +44 1604311 | Protected | — |
| +44 1604312 | Allocated | Simwood eSMS Limited |
| +44 1604313 | Allocated | IOVOX Limited |
| +44 1604314 | Allocated | 8x8 Communications UK Limited |
| +44 1604315 | Allocated | TalkTalk Communications Limited |
| +44 1604316 | Allocated | ICC Networks Ltd |
| +44 1604317 | Allocated | Sky UK Limited |
| +44 1604318 | Allocated | IOVOX Limited |
| +44 1604319 | Allocated | Sky UK Limited |
| +44 1604320 | Allocated | Gamma Telecom Holdings Limited |
| +44 1604321 | Allocated | GCI Network Solutions Limited |
| +44 1604322 | Allocated | Andrews & Arnold (Numbers) Ltd |
| +44 1604323 | Allocated | TeleWare Group Limited |
| +44 1604324 | Protected | — |
| +44 1604325 | Allocated | Telecoms World Limited |
| +44 1604326 | Allocated | Gamma Telecom Holdings Limited |
| +44 1604327 | Protected | — |
| +44 1604328 | Allocated | Vonage Business Limited |
| +44 1604329 | Quarantined | — |
| +44 1604330 | Allocated | GCI Network Solutions Limited |
| +44 1604331 | Allocated | GCI Network Solutions Limited |
| +44 1604332 | Allocated | GCI Network Solutions Limited |
| +44 1604333 | Allocated | GCI Network Solutions Limited |
| +44 1604334 | Protected | — |
| +44 1604335 | Protected | — |
| +44 1604336 | Protected | — |
| +44 1604337 | Protected | — |
| +44 1604338 | Protected | — |
| +44 1604339 | Protected | — |
| +44 1604340 | Allocated | Gamma Telecom Holdings Limited |
| +44 1604341 | Allocated | Entanet International Ltd |
| +44 1604342 | Allocated | Telappliant Limited |
| +44 1604343 | Allocated | Gamma Telecom Holdings Limited |
| +44 1604344 | Allocated | Colt Technology Services |
| +44 1604345 | Allocated | BT |
| +44 1604346 | Allocated | Colt Technology Services |
| +44 1604347 | Allocated | Colt Technology Services |
| +44 1604348 | Allocated | Media Hawk Ltd |
| +44 1604349 | Allocated | Gamma Telecom Holdings Limited |
| +44 1604350 | Allocated | TGL Services (UK) Ltd |
| +44 1604351 | Allocated | TGL Services (UK) Ltd |
| +44 1604352 | Allocated | TGL Services (UK) Ltd |
| +44 1604353 | Allocated | Voxbone SA |
| +44 1604354 | Allocated | TGL Services (UK) Ltd |
| +44 1604355 | Allocated | Gamma Telecom Holdings Limited |
| +44 1604356 | Allocated | BT |
| +44 1604357 | Allocated | Gamma Telecom Holdings Limited |
| +44 1604358 | Allocated | Calltracks Limited |
| +44 1604359 | Allocated | Voxbone SA |
| +44 1604360 | Allocated | Gamma Telecom Holdings Limited |
| +44 1604361 | Allocated | GCI Network Solutions Limited |
| +44 1604362 | Allocated | GCI Network Solutions Limited |
| +44 1604363 | Allocated | GCI Network Solutions Limited |
| +44 1604364 | Allocated | GCI Network Solutions Limited |
| +44 1604365 | Allocated | GCI Network Solutions Limited |
| +44 1604366 | Allocated | GCI Network Solutions Limited |
| +44 1604367 | Allocated | GCI Network Solutions Limited |
| +44 1604368 | Allocated | GCI Network Solutions Limited |
| +44 1604369 | Allocated | GCI Network Solutions Limited |
| +44 1604370 | Protected | — |
| +44 1604371 | Allocated | Sky UK Limited |
| +44 1604372 | Allocated | Kalnet4U Ltd |
| +44 1604373 | Allocated | Sky UK Limited |
| +44 1604374 | Allocated | Sky UK Limited |
| +44 1604375 | Allocated | Sky UK Limited |
| +44 1604376 | Allocated | TalkTalk Communications Limited |
| +44 1604377 | Allocated | Nuso Cloud UK Limited |
| +44 1604378 | Allocated | TalkTalk Communications Limited |
| +44 1604379 | Allocated | Gamma Telecom Holdings Limited |
| +44 1604380 | Allocated | Gamma Telecom Holdings Limited |
| +44 1604381 | Protected | — |
| +44 1604382 | Protected | — |
| +44 1604383 | Protected | — |
| +44 1604384 | Allocated | Gamma Telecom Holdings Limited |
| +44 1604385 | Allocated | Buzz Networks Limited |
| +44 1604386 | Allocated | 8x8 UK Limited |
| +44 1604387 | Protected | — |
| +44 1604388 | Allocated | Minotaur Telecom Limited |
| +44 1604389 | Allocated | Liquid 11 Limited |
| +44 1604390 | Allocated | Vodafone Ltd (C&W) |
| +44 1604391 | Allocated | Vodafone Ltd (C&W) |
| +44 1604392 | Allocated | Vodafone Ltd (C&W) |
| +44 1604393 | Allocated | Vodafone Ltd (C&W) |
| +44 1604394 | Allocated | Vodafone Ltd (C&W) |
| +44 1604395 | Allocated | Vodafone Ltd (C&W) |
| +44 1604396 | Allocated | Vodafone Ltd (C&W) |
| +44 1604397 | Protected | — |
| +44 1604398 | Protected | — |
| +44 1604399 | Protected | — |
| +44 160440 | Allocated | BT |
| +44 160441 | Allocated | BT |
| +44 160442 | Allocated | AQL Wholesale Ltd |
| +44 1604430 | Protected | — |
| +44 1604431 | Protected | — |
| +44 1604432 | Allocated | BT |
| +44 1604433 | Allocated | BT |
Related lookups
- 01933 Wellingborough11 km away
- 01536 Kettering15 km away
- 01327 Daventry21 km away
- 01858 Market Harborough22 km away
- BT120 allocated blocks on 01604
- Gamma Telecom Holdings Limited33 allocated blocks on 01604
- GCI Network Solutions Limited24 allocated blocks on 01604
- All UK towns A–ZDialling codes by town
- More Northamptonshire codesSame region
- All UK area codesBrowse every 01/02 dialling code
- Lookup any UK numberFree reverse phone lookup
- UK area codes explainedCornerstone guide
- 020 London numbers explainedCornerstone guide
- 0330 numbers explainedCornerstone guide
- How Ofcom allocates UK phone numbersCornerstone guide
FAQs about 01604
Where is area code 01604?
01604 is Ofcom's Northampton numbering area, in Northamptonshire, East Midlands England. Its exchange town is in West Northamptonshire. From abroad, drop the 0 and dial +44 1604.
Do I need to dial 01604 for a local call?
Traditionally not from another 01604 landline, but it now depends on your provider: Ofcom stopped requiring providers to offer local (code-free) dialling on 11 March 2022. Dialling 01604 first always works, and mobiles always need it.
How are 01604 numbers written?
Numbers on 01604 use Ofcom's 4+6 format: the 5-digit code (including the leading 0) followed by a 6-digit local number — written like 01604 234 567. From abroad the leading zero is dropped: +44 1604 then the local number.
What was the 01604 area code before?
01604 took its current form at PhONEday on 16 April 1995, when a "1" was inserted into every UK geographic code — before that the area dialled 0604. Old signage or stationery showing 0604 refers to the same Northampton numbers.
Which phone companies hold 01604 numbers?
Ofcom lists 89 providers with allocated blocks on 01604. The largest are BT with 120 of the 353 allocated blocks, Gamma Telecom Holdings Limited with 33 of the 353 allocated blocks and GCI Network Solutions Limited with 24 of the 353 allocated blocks. Numbers can be ported, so a number's current provider may differ from the block's holder.
Are 01604 numbers reported as scams?
Visitors have checked 23 different 01604 numbers here 26 times since May 2026. 1 caller verdict have been left on 01604 numbers: 0 scam, 0 nuisance and 1 safe.
Which area codes are next to 01604?
By distance between exchange towns, the nearest other codes are 01933 Wellingborough (11 km), 01536 Kettering (15 km), 01327 Daventry (21 km) and 01858 Market Harborough (22 km).
How do I report a scam call from a 01604 number?
On a mobile, text the caller's number to 7726 (free). If you lost money or shared details, call your bank and report it to Report Fraud (0300 123 2040), which replaced Action Fraud in December 2025. Unwanted sales calls go to the ICO after registering with the Telephone Preference Service.