mathematics

Unique Street Reference Number

Unique Street Reference Number is a mathematics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Unique Street Reference Number rather than just read about it. In short: The Unique Street Reference Number (USRN) is an eight-digit unique identifier (a geocode) for every street in the UK. Responsible agencies USRNs for England and Wales are published in the National Street Gazetteer (NSG) database, the authoritative source of information about streets in England and Wales.

Key takeaways

Unique Street Reference Number belongs to mathematics; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Unique Street Reference Number to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Unique Street Reference Number from memory before moving on to harder problems.

Reference excerpt

The Unique Street Reference Number (USRN) is an eight-digit unique identifier (a geocode) for every street in the UK.

Responsible agencies USRNs for England and Wales are published in the National Street Gazetteer (NSG) database, the authoritative source of information about streets in England and Wales. The NSG is managed by GeoPlace, a joint venture between the Local Government Association and Ordnance Survey (OS). GeoPlace is also responsible for centrally managing and allocating USRN ranges to local authorities, which have sole statutory responsibility over assigning USRNs to streets. The locally assigned USRNs are then regularly fed back into the NSG via the Local Street Gazetteers. USRNs in Scotland are managed by the Improvement Service and recorded in the Street Gazetteer of Scotland, the authoritative street database for Scotland. The data has been available alongside England & Wales data in OS products since 2021, enabled by the Public Sector Geospatial Agreement (PSGA). In Northern Ireland USRNs are overseen by the Department for Infrastructure.

Access to data The USRN is available from the NSG and included in Ordnance Survey's OS MasterMap Highways Network product. USRNs can also be found on the site Find My Street created by GeoPlace. From 1 July 2020, the Government requires USRNs and Unique Property Reference Numbers (UPRNs) to be available under an Open Government Licence (OGL). The OS Open USRN dataset is derived from the OS MasterMap Highways Network product. The Government Digital Service has mandated the UPRN and USRN as "the public sector standard for referencing and sharing property and street information".

References

External links

Find My Street Map of USRNs overlaid on OpenStreetMap data

Illustrations

Worked examples

Example 1 — a first encounter with Unique Street Reference Number

Start with the simplest possible case. Write down what Unique Street Reference Number claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In mathematics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Unique Street Reference Number before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Unique Street Reference Number ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Unique Street Reference Number

In research: Unique Street Reference Number appears in mathematics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Unique Street Reference Number in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Unique Street Reference Number is common in secondary-school and first-year university syllabi. It links to neighbouring topics Geocodes, Streets in the United Kingdom, so understanding it makes those chapters shorter.
In everyday life: Look for Unique Street Reference Number outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Unique Street Reference Number in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Unique Street Reference Number means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Unique Street Reference Number out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Unique Street Reference Number in simple terms?

The Unique Street Reference Number (USRN) is an eight-digit unique identifier (a geocode) for every street in the UK. Responsible agencies USRNs for England and Wales are published in the National Street Gazetteer (NSG) database, the authoritative source of information about streets in England and…

Why does Unique Street Reference Number matter?

Because it connects several mathematics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Unique Street Reference Number?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Unique Street Reference Number.