UK Area Code Finder
Quick and easy telephone dialling code information
023 is the telephone area code for Portsmouth and Southampton
All landline phone numbers beginning with the 023 area code, which includes those starting with 023 94, are for Portsmouth and Southampton. Those starting with 023 9 are specifically for Portsmouth.
The 023 area code at the beginning is optional; if you're dialling from one Southampton or Portsmouth landline phone to another you can dial just the eight-digit local phone number.
Portsmouth and Southampton have had the three-digit area code 023 since the year 2000. This is always followed by an eight-digit local number.
The correct way to write a Portsmouth or Southampton phone number is
During the year 2000, Portsmouth's area code changed from 01705 to 023, while its old six-digit local phone numbers were prefixed with '92' to make them eight digits long.
The new system gives Portsmouth and Southampton nearly 80 million numbers: