# Code-Point Technical Specification

Code-Point is a dataset that contains postcode units for Great Britain and Northern Ireland, each having a notional geographical location. Postcodes are an alphanumeric abbreviated form of an address. Postcode units are unique references and identify an average of 15 addresses. In some cases, where an address receives a substantial amount of mail, a postcode will apply to only one address and is defined as a large-user postcode. The maximum number of addresses in a postcode is 100.

## Index <a href="#id-2.-product-structure" id="id-2.-product-structure"></a>

This technical specification includes the following sections:

* [Product structure](/os-downloads/products/areas-and-zones-portfolio/code-point/code-point-technical-specification/product-structure.md)
* [Supply formats](/os-downloads/products/areas-and-zones-portfolio/code-point/code-point-technical-specification/supply-formats.md)


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