UK Address Generator

How a UK address is written

Royal Mail’s layout puts the building first and the postcode last, each element on its own line: an optional flat or building name, the house number and thoroughfare (42 Hawthorn Close), an optional locality, the post town (Royal Mail prefers it in capitals on envelopes) and the postcode on its own line. Counties are no longer required — Royal Mail dropped them from the addressing standard in 1996 — so a UK form should not make “County” mandatory.

Flats are written before the street line (Flat 3 / 42 Hawthorn Close), and some properties have a name instead of, or as well as, a number (Rose Cottage, Mill Lane). The generator produces both.

Postcode structure

A UK postcode has an outward code and an inward code separated by a space: LS6 2QD.

• Area – one or two letters (LS Leeds, G Glasgow, BT Northern Ireland).
• District – one or two digits, sometimes followed by a letter in central London (SW1A, EC1V).
• Sector – the single digit after the space.
• Unit – two letters, which never include C, I, K, M, O or V.

The outward code is 2 to 4 characters and the whole postcode 6 to 8 characters with the space. A practical validation regex is ^[A-Z]{1,2}\d[A-Z\d]? \d[ABD-HJLNP-UW-Z]{2}$; normalise case and spacing first, because users type ls62qd and LS6 2QD.

England, Scotland, Wales and Northern Ireland

The UK has no states. The four constituent countries (ISO 3166-2 codes GB-ENG, GB-SCT, GB-WLS, GB-NIR) are useful for tax, shipping-zone or reporting logic, but they are not part of a postal address. The generator returns the country in a separate field so you can test that logic without printing it on the label. Note that the ISO country code is GB, while many people type UK; accept both in free-text input and store GB.

Testing tips for UK address forms

• Make the postcode the anchor: many UK checkouts look up addresses by postcode. Generated postcodes have a real outward code but a random inward code, so a lookup should return no match — a good test for your manual-entry fallback.
• Accept all six outward-code shapes — A9, A99, AA9, AA99, A9A and AA9A (M1, B15, LS6, CF24, W1A, SW1A).
• Allow apostrophes, hyphens and commas in street and town names (Newcastle upon Tyne, Stratford-upon-Avon).
• Crown dependencies (Jersey JE, Guernsey GY, Isle of Man IM) use the same postcode shape but are not part of the UK for VAT.

What makes these addresses fictional

Post towns and postcode districts are real so that format checks and region rules behave realistically. Street names are built from generic words and the numbers are random; any match with a real property is coincidental. Use the output only in test, staging or demo systems.

Countries of United Kingdom

The generator uses the 4 first-level countries below, with the codes used in addresses. Cities are picked from 18 places spread across the country, each with postcodes from its own range.

Example United Kingdom test addresses

Validation pattern used for the Postcode: ^[A-Z]{1,2}\d[A-Z\d]? \d[ABD-HJLNP-UW-Z]{2}$. It checks the format only — whether a code is actually in use is known only to the postal operator.

Phone numbers in United Kingdom test data

UK numbers start with 0 nationally (+44 internationally, dropping the 0). The generator uses only Ofcom’s drama ranges: 07700 900000–900999 for mobiles, the 496 0xxx / 7946 0xxx / 2018 0xxx blocks for the cities that have one, and 01632 960xxx elsewhere.

Source: Ofcom – Telephone numbers for use in TV and radio drama programmes (checked October 2026). All ranges: test e-mail addresses and fictional phone numbers.

Sources

• Postcodes in the United Kingdom (format)
• ISO 3166-2:GB
• Ofcom – telephone numbers for drama (archived copy)

Postcode ranges, region lists and address conventions checked against these sources in October 2026. Street names in the generator are synthetic.

Other countries: United StatesCanadaAustraliaIndiaGermanyFranceSpainItalyNetherlandsBrazilMexicoJapanPhilippinesPakistanNigeriaSouth AfricaTurkeyIndonesiaUnited Arab Emirates