# OS Open USRN Documentation

An open dataset containing all Unique Street Reference Numbers (USRNs) from [OS MasterMap Highways Network](https://docs.os.uk/os-downloads/products/transport-network-portfolio/os-mastermap-highways-network-fundamentals) with a simplified line geometry.

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**This product is updated monthly.**
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<figure><img src="https://1897589978-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FcNpJpLP8RROUaWVQo5ea%2Fuploads%2FcS9DpMy8QMHKKulV5PlK%2Fopen-usrn-datahub-2-large.png?alt=media&#x26;token=be6dd492-b248-4e34-8e00-4d34ffc33440" alt="A representation of OS Open USRN data showing streets drawn on a background map of a large urban area."><figcaption><p>A representation of OS Open USRN data against a background map.</p></figcaption></figure>

A USRN is a unique and persistent identifier for every street, road, track, path, cycle track or cycle way in Great Britain.

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OS Open USRN is part of the OS Open Identifiers 'Family' of products, which includes four OpenData products: OS Open Linked Identifiers, OS Open TOID, OS Open UPRN and OS Open USRN. The products within this family allow you to easily share information held against a range of identifiers and to link together information associated with these identifiers.
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**Essential identifiers for streets**

Our Open USRN product contains USRNs (Unique Street Reference Numbers) across Great Britain. USRNs are the authoritative identifier assigned to and uniquely identifying streets, and are essential for managing Great Britain's highways. Once it's allocated to a street record, a USRN will never change or be reused.

**Authoritative source**

The USRNs in OS Open USRN are allocated by Highway or Road Authorities and Highway Bodies, under their statutory responsibility to maintain this information. This means you can have confidence you’re accessing an authoritative source of these identifiers.

**Complete USRN data**

All USRNs present in [OS MasterMap Highways Network](https://docs.os.uk/os-downloads/products/transport-network-portfolio/os-mastermap-highways-network-fundamentals/os-mastermap-highways-network-overview) are also included in this product – so you can be sure you’re not missing out.

**Share and link data**

OS Open USRN will enable you to start sharing and linking together information about USRNs which you can visualise with a location.
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OS Open USRN enables users to:

* Share information held against a USRN with a location
* Link together information associated with USRNs
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* **Access:** Download via the [OS Data Hub](https://osdatahub.os.uk/)
* **Data theme:** Transport
* **Data structure:** Vector – Identifiers
* **Coverage:** Great Britain
* **Scale:** 1:1 250 to 1:10 000
* **Format:** GeoPackage
* **Ordering area:** All of Great Britain
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## How to get this product

Access to this OS OpenData product is free through the [OS Data Hub](https://osdatahub.os.uk/data/downloads/open/OpenUSRN).

## What's next?

To access additional documentation and resources relating to this product, please refer to the following:

<table data-view="cards"><thead><tr><th></th><th></th><th data-hidden data-card-cover data-type="image">Cover image</th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td><h4>OS Open Identifiers Family Information</h4></td><td>This page gives context and information about the OS Open Identifiers 'Family' of products, including explaining what identifiers are and introducing the OS identifiers (TOID, UPRN and USRN).</td><td data-object-fit="cover" data-alt="OS Open Linked Identifiers diagram showing the interconnected relationship in the product between TOIDs, UPRN, USRNs, and GUID."><a href="https://1897589978-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FcNpJpLP8RROUaWVQo5ea%2Fuploads%2FevuHYX9cyID9OYhzPVGe%2FLinked_identifiers_Cover.avif?alt=media&#x26;token=5d07dde3-8aeb-4930-9526-e5d5487c8306">Linked_identifiers_Cover.avif</a></td><td><a href="../addresses-and-names-portfolio/os-open-uprn/os-open-uprn-overview/what-is-an-identifier">what-is-an-identifier</a></td></tr><tr><td><h4>Overview</h4></td><td>The overview introduces OS Open USRN and gives context for all users – highlighting key features, providing examples of potential uses, and listing details such as supply formats, currency, etc.</td><td data-object-fit="cover" data-alt="Example image showing OS Open USRN product data over a background map."><a href="https://1897589978-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FcNpJpLP8RROUaWVQo5ea%2Fuploads%2FMRCNALW1vNz7gMRhK6ZB%2FUSRN-attribution-1.png?alt=media&#x26;token=ff3f6e75-97b1-4b96-bc0c-c29952ac4fe2">USRN-attribution-1.png</a></td><td><a href="os-open-usrn/os-open-usrn-overview">os-open-usrn-overview</a></td></tr><tr><td><h4>Technical Specification</h4></td><td>The technical specification provides detailed technical information about OS Open USRN. It is targeted at technical users and software developers.</td><td data-object-fit="cover" data-alt="Example image showing OS Open USRN product data over a background map."><a href="https://1897589978-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FcNpJpLP8RROUaWVQo5ea%2Fuploads%2F7efrdCfilFx1MR1Y8mAb%2Fopen-usrn-datahub-1-large.png?alt=media&#x26;token=fdcc523e-3cd4-4178-a2b9-200e20a552ad">open-usrn-datahub-1-large.png</a></td><td><a href="os-open-usrn/os-open-usrn-technical-specification">os-open-usrn-technical-specification</a></td></tr><tr><td><h4>Ordnance Survey Website</h4></td><td>View OS Open USRN product information and find out how to get this product on the OS website.</td><td></td><td><a href="https://www.ordnancesurvey.co.uk/products/os-open-usrn">https://www.ordnancesurvey.co.uk/products/os-open-usrn</a></td></tr></tbody></table>

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New users should start with the Overview to gain high-level insights into the product. The Technical Specification contains detailed technical insights.

We recommend referring to the OS Open Identifiers Family information page in combination with the Overview and Technical Specification documents for OS Open USRN.
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