01491 Area Code — Henley-on-Thames, Twyford & Wargrave
01491 is the UK dialling code for Henley-on-Thames in Oxfordshire, also serving Twyford, Wargrave and Sonning Common, allocated by Ofcom under the National Telephone Numbering Plan. Our database has tracked 43 distinct 01491 numbers across 57 public lookups.
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Quick facts
Area code
01491
Location
Henley-on-Thames
County
Oxfordshire
Region
South East England
Number type
Geographic landline
Number format
01491 XXX XXX
Operators serving
8+
Call cost
Standard rate
About the 01491 dialling code
01491 is the UK geographic dialling code for Henley-on-Thames, allocated by Ofcom under the National Telephone Numbering Plan. It is used by landlines — and increasingly VoIP lines — registered to the Henley-on-Thames area.
A full Henley-on-Thames number is normally written as 01491 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 01491 number no longer guarantees the caller is physically in Henley-on-Thames. Fraudsters also "spoof" local codes like 01491 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 01491 dialling area
The marker shows Henley-on-Thames; the shaded circle is an approximate indication of the area the 01491 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 01491
Settlements in and around the Henley-on-Thames dialling area that typically use 01491 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 01491 from abroad
From outside the UK, dial your international access prefix, then the UK country code 44, then 1491 (the area code without its leading zero) and the local number.
| Calling from | Dial |
|---|---|
| United States & Canada | 011 44 1491 … |
| Europe / most of the world | 00 44 1491 … |
| Australia | 0011 44 1491 … |
| Any mobile phone | +44 1491 … |
History of the 01491 code
The code was 0491 until PhONEday, 16 April 1995, when a "1" was inserted after the leading zero to create 01491.
Top searched 01491 numbers
These are the 01491 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 |
|---|---|---|
| 01491 743085 | 4 | 21 Jun 2026 |
| 01491 522751 | 3 | 6 Jul 2026 |
| 01491 577743 | 2 | 9 Jul 2026 |
| 01491 743086 | 2 | 4 Jul 2026 |
| 01491 671435 | 2 | 3 Jul 2026 |
| 01491 527533 | 2 | 2 Jul 2026 |
| 01491 637302 | 2 | 1 Jul 2026 |
| 01491 917708 | 2 | 18 Jun 2026 |
| 01491 523203 | 2 | 17 Jun 2026 |
| 01491 528323 | 2 | 20 May 2026 |
| 01491 743044 | 2 | 15 May 2026 |
| 01491 913989 | 1 | 10 Jul 2026 |
| 01491 712344 | 1 | 9 Jul 2026 |
| 01491 838489 | 1 | 7 Jul 2026 |
| 01491 612908 | 1 | 6 Jul 2026 |
| 01491 743082 | 1 | 6 Jul 2026 |
| 01491 917714 | 1 | 5 Jul 2026 |
| 01491 917713 | 1 | 3 Jul 2026 |
| 01491 635357 | 1 | 2 Jul 2026 |
| 01491 635317 | 1 | 2 Jul 2026 |
Is a call from 01491 safe?
Most 01491 calls are ordinary local calls from Henley-on-Thames homes and businesses. The main risk to be aware of is "neighbour spoofing", where a scammer fakes a local 01491 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 01491 (Henley-on-Thames) number from outside the UK, drop the leading zero and dial +44 1491 followed by the local number.
Operators serving Henley-on-Thames
These UK communications providers have been allocated 01491 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 |
|---|---|
| BT | 17 |
| GCI Network Solutions Limited | 12 |
| Virgin Media Limited | 6 |
| Vodafone Ltd (C&W) | 6 |
| GTT-EMEA LTD | 4 |
| Resilient Limited | 3 |
| TalkTalk Communications Limited | 3 |
| Served Up Limited | 2 |
Ofcom number ranges on 01491
Ofcom's National Numbering Plan lists 415 number blocks under 01491, of which 146 are allocated to 97 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) |
|---|---|---|
0149120… | Allocated | Virgin Media Limited |
0149121… | Allocated | Served Up Limited |
01491220… | Allocated | VoiceHost Limited |
01491221… | Allocated | Windsor Telecom Limited |
01491222… | Allocated | VoiceHost Limited |
01491223… | Allocated | Core Telecom Limited |
01491225… | Allocated | Invoco Ltd |
01491226… | Allocated | Hello Telecom (UK) Limited |
01491227… | Allocated | Internexus Networks Limited |
01491228… | Allocated | Tuxtel Ltd |
01491244… | Allocated | Digital Mail Limited |
0149126… | Allocated | TTNC Limited |
Showing 12 of 146 allocated blocks. Source: Ofcom telephone numbering data, updated weekly.
How to block and report 01491 spam calls
Block or report 01491
- You can block 01491 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 01491 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 01491 code
Where is the 01491 area code?
The 01491 area code is allocated by Ofcom to Henley-on-Thames in Oxfordshire, United Kingdom. It is a geographic UK landline dialling code under the National Telephone Numbering Plan. The surrounding dialling area also takes in Twyford, Wargrave, Sonning Common and nearby villages.
Is 01491 always a Henley-on-Thames number?
Numbers with the 01491 prefix were originally allocated by Ofcom to Henley-on-Thames. 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 Henley-on-Thames.
How do I block 01491 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 01491 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 01491 call cost?
Calls to UK 01491 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 Henley-on-Thames — useful when a caller is nearby but outside the 01491 boundary.
Living in or moving to Henley-on-Thames?
Our free postcode reports cover house prices, crime, broadband and schools for the districts around Henley-on-Thames.
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.