The 01491 area code is a 4 digit geographical dialling code (excluding the zero) used in telecommunications for the Henley-on-Thames area.
The local telephone numbers within the 01491 are 6 digits long.
The correct format in which to write a telephone number from the Henley-on-Thames area code is (01491) [x][x][x][x][x][x].
The Henley-on-Thames 01491 dialling code intersects the counties of Oxfordshire, Buckinghamshire and Berkshire in the South East Region of the UK.
You will need to use a dialling code if you are calling from a mobile phone or a landline outside of the 01491 Henley-on-Thames dialling code area. If you are calling a local number within the same area code with a landline telephone you do not need to use the 01491 dialling code.
If you are calling from outside of the UK. You will need to add the code for dialling internationally. This varies country to country, followed by the UK country code (44) followed by the area code without the initial zero (1491).
|Region||International Prefix||Country Code||Area Code|
|United States and Canada||011||44||1491|
Before the 16th April 1995 known as PhONEday which changed telephone area codes by inserting a 1 at the beginning. The area code was 0491.
the historic mnemonic code for the 01491 area was HY1. The first two characters are taken from the letters H and Y in HenleY-on-thames. On an old rotary dial telephone this was entered by dialling the numbers 4, 9 and 1.
The shaded area on the map represent the estimated extent of the 01491 Henley-on-Thames phone area code.
The blue icons on the map represent the locations of telephone exchanges serving the 01491 area. Click on an icon for more details
|Watlington (South Oxfordshire)|
|WALLINGFORD ATE (THWL)|
|CHECKENDON ATE (THCKN)|
|CHOLSEY ATE (THCLY)|
|GORING ATE (THGO)|
|HENLEY ATE (THHT)|
|NETTLEBED ATE (THNB)|
|ROTHERFIELD GREYS UAX (THRO)|
|TURVILLE HEATH UAX (THTV)|
|UPPER BASILDON ATE (THUB)|