# Code-Point Getting Started Guide

Code-Point locates over 1.7 million 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.

<figure><img src="/files/nyiqIrXSPZVzWqmctXKt" alt="Screenshot of the Code-Point product showing how postcodes are represented."><figcaption><p><em>Code-Point provides geographical locations for postcodes in Great Britain and Northern Ireland.</em></p></figcaption></figure>

{% hint style="info" %}

* This getting started guide focusses on using the product in comma-separated values (CSV) format only.&#x20;
* For guidance on using the product in GeoPackage format, please see the [Getting started with GeoPackage](/os-downloads/resources/product-resources/getting-started-with-geopackage-and-vector-tiles-guides/getting-started-with-geopackage.md) guide.
  {% endhint %}

### Index <a href="#index" id="index"></a>

This getting started guide includes the following sections:

* [Product supply](/os-downloads/products/areas-and-zones-portfolio/code-point/code-point-getting-started-guide/product-supply.md)
* [Data structure](/os-downloads/products/areas-and-zones-portfolio/code-point/code-point-getting-started-guide/data-structure.md)
* [CSV file processing](/os-downloads/products/areas-and-zones-portfolio/code-point/code-point-getting-started-guide/csv-file-processing.md)
* [Data measures](/os-downloads/products/areas-and-zones-portfolio/code-point/code-point-getting-started-guide/data-measures.md)
* [Metadata](/os-downloads/products/areas-and-zones-portfolio/code-point/code-point-getting-started-guide/metadata.md)
* [Glossary](/os-downloads/products/areas-and-zones-portfolio/code-point/code-point-getting-started-guide/glossary.md)


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