Postcodes
Postcode vs Area Code: Key Differences
A postcode locates a delivery area for mail, while an area code is part of a telephone number. Learn how the two differ and why they get mixed up.
Updated 14 October 2026 · 3 min read
A postcode and an area code both look like short numbers connected to a place, which is why people confuse them. They belong to entirely different systems: one is for mail and the other is for telephone calls.
What a postcode is
A postcode is part of an address. It is assigned by the national postal operator, and it helps route mail and parcels to a delivery area. See what postcodes are used for.
What an area code is
An area code, sometimes called a dialling or trunk code, is part of a telephone number. It identifies a geographic region or a type of service within the national telephone numbering plan. It is managed by the telecommunications regulator and telephone operators, not the postal service.
Side by side
- Purpose: postcode routes mail; area code routes calls.
- Lives in: postcode in an address; area code in a phone number.
- Managed by: postal operator versus telecom regulator.
- Boundaries: delivery rounds versus telephone exchange regions.
- Changes: reorganised with rounds versus numbering plan changes.
The areas they cover are often different, so a phone area code does not tell you the postcode, and the reverse is also true.
Why they are confused
In some countries both are short numbers written by the same person on the same form. Mobile numbers have also made area codes less tied to place, since a phone can keep its number in a different city. Online forms with a "postal code" field often receive phone fragments by mistake; see common postcode mistakes.
Related terms
If you were looking for the names used in different countries, read postcode vs ZIP code and postcode vs PIN code.
Other codes people compare
An exact-location code, such as a UPCS code, is another kind of identifier. It refers to a 3 m by 3 m cell on a map, it is neither a phone area code nor an official postal code, and it can be shared alongside the address.
Key takeaway
If a form asks for a postal code and you are unsure, look at an envelope or bill addressed to you and copy the code from the address block. The number printed there is the one the form wants, not any part of your phone number.
Frequently asked questions
Is an area code the same as a postal code?
No. An area code is part of a telephone number and routes calls. A postal code is part of an address and routes mail.
Can I use my phone area code as a postcode?
No. The two systems are separate and unrelated, and one cannot be used in place of the other.