> For the complete documentation index, see [llms.txt](https://docs.os.uk/os-downloads/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.os.uk/os-downloads/products/areas-and-zones-portfolio/code-point/code-point-getting-started-guide.md). # Code-Point Getting Started Guide This getting started guide provides instructions for using Code-Point in different software applications. Users with limited technical knowledge will be able to follow this 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.
Screenshot of the Code-Point product showing how postcodes are represented.

Code-Point provides geographical locations for postcodes in Great Britain and Northern Ireland.

{% hint style="info" %} * This getting started guide focusses on using the product in comma-separated values (CSV) format only. * 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 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) --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation by asking a question. Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters: ``` GET https://docs.os.uk/os-downloads/products/areas-and-zones-portfolio/code-point/code-point-getting-started-guide.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.