01740 Area Code — Sedgefield, Ferryhill & Fishburn
01740 is the UK dialling code for Sedgefield in County Durham, also serving Ferryhill, Fishburn and Trimdon, allocated by Ofcom under the National Telephone Numbering Plan. Our database has tracked 97 distinct 01740 numbers across 102 public lookups.
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Quick facts
Area code
01740
Location
Sedgefield
County
County Durham
Region
North East England
Number type
Geographic landline
Number format
01740 XXX XXX
Operators serving
8+
Call cost
Standard rate
About the 01740 dialling code
01740 is the UK geographic dialling code for Sedgefield, allocated by Ofcom under the National Telephone Numbering Plan. It is used by landlines — and increasingly VoIP lines — registered to the Sedgefield area.
A full Sedgefield number is normally written as 01740 XXXXXX. You can dial the local part on its own from within the same area, or the full number from anywhere in the UK.
Because of UK number portability and internet calling, a 01740 number no longer guarantees the caller is physically in Sedgefield. Fraudsters also "spoof" local codes like 01740 so an unknown call looks like a nearby business or neighbour — so treat an unexpected call on what is actually said, not on the area code alone.
Map of the 01740 dialling area
The marker shows Sedgefield; the shaded circle is an approximate indication of the area the 01740 code serves — exact Ofcom charging-area boundaries are irregular and don't follow a neat radius.
Map data © OpenStreetMap contributors. View larger map
Areas typically served by 01740
Settlements in and around the Sedgefield dialling area that typically use 01740 numbers. Approximate — Ofcom charging-area boundaries don't follow town or county lines exactly, and properties near a boundary may take a neighbouring code.
Calling 01740 from abroad
From outside the UK, dial your international access prefix, then the UK country code 44, then 1740 (the area code without its leading zero) and the local number.
| Calling from | Dial |
|---|---|
| United States & Canada | 011 44 1740 … |
| Europe / most of the world | 00 44 1740 … |
| Australia | 0011 44 1740 … |
| Any mobile phone | +44 1740 … |
History of the 01740 code
The code was 0740 until PhONEday, 16 April 1995, when a "1" was inserted after the leading zero to create 01740.
Top searched 01740 numbers
These are the 01740 numbers most-looked-up by visitors to our number checker. Click any number to see its full lookup page with risk-level, range holder, and community reports.
| Number | Searches | Last looked up |
|---|---|---|
| 01740 620300 | 2 | 2 Jul 2026 |
| 01740 620331 | 2 | 29 Jun 2026 |
| 01740 613596 | 2 | 27 Jun 2026 |
| 01740 620274 | 2 | 26 Jun 2026 |
| 01740 626662 | 2 | 17 Jun 2026 |
| 01740 816227 | 1 | 7 Jul 2026 |
| 01740 622835 | 1 | 30 Jun 2026 |
| 01740 626688 | 1 | 29 Jun 2026 |
| 01740 620330 | 1 | 29 Jun 2026 |
| 01740 620272 | 1 | 29 Jun 2026 |
| 01740 626627 | 1 | 29 Jun 2026 |
| 01740 613595 | 1 | 29 Jun 2026 |
| 01740 626629 | 1 | 29 Jun 2026 |
| 01740 630674 | 1 | 29 Jun 2026 |
| 01740 630733 | 1 | 29 Jun 2026 |
| 01740 630667 | 1 | 29 Jun 2026 |
| 01740 613666 | 1 | 29 Jun 2026 |
| 01740 626633 | 1 | 29 Jun 2026 |
| 01740 630671 | 1 | 29 Jun 2026 |
| 01740 613664 | 1 | 28 Jun 2026 |
Is a call from 01740 safe?
Most 01740 calls are ordinary local calls from Sedgefield homes and businesses. The main risk to be aware of is "neighbour spoofing", where a scammer fakes a local 01740 prefix so you are more likely to answer. Never share bank details, passwords or one-time security codes with an unexpected caller, even when the number looks local — hang up and call the organisation back on a number you have verified yourself.
To call a 01740 (Sedgefield) number from outside the UK, drop the leading zero and dial +44 1740 followed by the local number.
Operators serving Sedgefield
These UK communications providers have been allocated 01740 number blocks by Ofcom. The number of blocks per operator gives a rough sense of how widely each provider serves this area.
| Provider (Ofcom-allocated) | Allocated blocks |
|---|---|
| Virgin Media Limited | 12 |
| GCI Network Solutions Limited | 11 |
| BT | 7 |
| Gamma Telecom Holdings Limited | 5 |
| TalkTalk Communications Limited | 3 |
| Vodafone Ltd (C&W) | 3 |
| Sky UK Limited | 3 |
| Digital Space Group Limited | 2 |
Ofcom number ranges on 01740
Ofcom's National Numbering Plan lists 451 number blocks under 01740, of which 130 are allocated to 90 communications providers. The first allocated blocks are shown below — look up any full number with the number checker to see its exact range holder.
| Number block | Status | Range holder (Ofcom-allocated) |
|---|---|---|
0174020… | Allocated | TelNG Limited |
0174021… | Allocated | Voiceflex Limited |
0174022… | Allocated | Localphone Limited |
01740238… | Allocated | TalkTalk Communications Limited |
01740239… | Allocated | TalkTalk Communications Limited |
0174025… | Allocated | (AQ) LIMITED |
0174026… | Allocated | VoIP-Un Limited |
01740270… | Allocated | YayYay Limited |
01740271… | Allocated | Convergence Group (wireless) Networks Limited |
01740273… | Allocated | Adepteo Limited |
01740276… | Allocated | Colt Technology Services |
01740277… | Allocated | Digital Space Group Limited |
Showing 12 of 130 allocated blocks. Source: Ofcom telephone numbering data, updated weekly.
How to block and report 01740 spam calls
Block or report 01740
- You can block 01740 directly from your recent-calls list on iPhone or Android, and forward scam texts free to 7726.
- Scam or fraud calls should be reported to Action Fraud (0300 123 2040) or Police Scotland (101); persistent marketing calls to the ICO / TPS.
Full step-by-step instructions for every phone, network-level blocking and all UK reporting routes are in our guide: How to block and report unwanted calls in the UK.
How to stop unwanted calls for good
Blocking 01740 numbers stops that one number, but determined nuisance callers simply switch numbers. Silencing unknown callers, enabling your network's free spam shield and registering with the TPS cut the volume across the board — our canonical guide walks through each step: How to block and report unwanted calls in the UK.
Frequently asked questions about the 01740 code
Where is the 01740 area code?
The 01740 area code is allocated by Ofcom to Sedgefield in County Durham, United Kingdom. It is a geographic UK landline dialling code under the National Telephone Numbering Plan. The surrounding dialling area also takes in Ferryhill, Fishburn, Trimdon and nearby villages.
Is 01740 always a Sedgefield number?
Numbers with the 01740 prefix were originally allocated by Ofcom to Sedgefield. With UK number portability and VoIP allowing geographic relocation while keeping the same number, the call origin can differ from the original area, but the prefix's official assigned location remains Sedgefield.
How do I block 01740 spam calls?
On iPhone, tap the (i) next to the number in Recents and choose Block this Caller. On Android, long-press the number in Recents and choose Block. To prevent unknown 01740 numbers ringing, enable Settings → Phone → Silence Unknown Callers (iPhone) or your dialler's spam filter (Android). Forward spam texts to 7726 free of charge.
How much does a 01740 call cost?
Calls to UK 01740 geographic numbers are charged at your provider's standard rate and are usually included in inclusive minutes on any modern landline or mobile plan.
Neighbouring dialling codes
Codes covering areas around Sedgefield — useful when a caller is nearby but outside the 01740 boundary.
Living in or moving to Sedgefield?
Our free postcode reports cover house prices, crime, broadband and schools for the districts around Sedgefield.
Check another UK number
Have the full 10- or 11-digit number? The UK Phone Number Checker shows the Ofcom range holder, risk level, and any community reports for that specific number.