World Postal Code > Europe Zip Code > United Kingdom Zip Code
United Kingdom ZIP Code Dataset
Sample Dataset United Kingdom
ISO | Country | Language | Region 1 | Region 2 | Region 3 | Region 4 | Locality | Zip Code | Latitude | Longitude | Timezone |
---|---|---|---|---|---|---|---|---|---|---|---|
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0JA | 51.581595 | -0.315256 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0LH | 51.579186 | -0.312777 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0LJ | 51.579189 | -0.311781 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0LL | 51.578875 | -0.309339 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0LN | 51.579165 | -0.310078 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0LW | 51.579302 | -0.307706 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0NJ | 51.58073 | -0.299556 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0QT | 51.576636 | -0.295668 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0QU | 51.57762 | -0.296497 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0QX | 51.577409 | -0.295639 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0QY | 51.57883 | -0.296856 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0RA | 51.578457 | -0.297217 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0RB | 51.579931 | -0.298403 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0RD | 51.581352 | -0.299605 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0RE | 51.580396 | -0.298169 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0RF | 51.58175 | -0.299201 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0ST | 51.582177 | -0.316317 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0TS | 51.58372 | -0.295533 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0TT | 51.584693 | -0.29502 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0TU | 51.58509 | -0.294515 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0UX | 51.583378 | -0.297971 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0YB | 51.585055 | -0.300102 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0YD | 51.58573 | -0.300164 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 6AE | 51.588469 | -0.359319 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 6AF | 51.588327 | -0.358833 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 6HX | 51.588914 | -0.361584 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 6QJ | 51.593153 | -0.347081 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7DA | 51.579049 | -0.361491 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7DB | 51.578705 | -0.362023 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7DD | 51.580121 | -0.363589 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7DE | 51.580421 | -0.36316 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7DF | 51.58129 | -0.364211 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7LT | 51.578746 | -0.370118 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7NZ | 51.580157 | -0.370689 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7PZ | 51.583402 | -0.366719 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7QA | 51.582295 | -0.365402 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7QB | 51.582096 | -0.365943 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7QD | 51.583587 | -0.367766 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7QE | 51.584088 | -0.36756 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7QL | 51.586969 | -0.373029 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7QN | 51.586651 | -0.37343 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7SA | 51.584719 | -0.361244 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7SE | 51.585526 | -0.361056 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7SJ | 51.584336 | -0.362167 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7SR | 51.585091 | -0.362111 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7ST | 51.584758 | -0.361445 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7SU | 51.585668 | -0.361585 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7SW | 51.584585 | -0.362562 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7SX | 51.585615 | -0.36163 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | City of Westminster | London | EC4A 2AH | 51.513968 | -0.11127 |
ISO | Country | Language | Region 1 | Region 2 | Region 3 | Region 4 | Locality | Zip Code | Latitude | Longitude | Timezone |
---|---|---|---|---|---|---|---|---|---|---|---|
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0JA | 51.581595 | -0.315256 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0LH | 51.579186 | -0.312777 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0LJ | 51.579189 | -0.311781 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0LL | 51.578875 | -0.309339 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0LN | 51.579165 | -0.310078 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0LW | 51.579302 | -0.307706 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0NJ | 51.58073 | -0.299556 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0QT | 51.576636 | -0.295668 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0QU | 51.57762 | -0.296497 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0QX | 51.577409 | -0.295639 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0QY | 51.57883 | -0.296856 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0RA | 51.578457 | -0.297217 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0RB | 51.579931 | -0.298403 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0RD | 51.581352 | -0.299605 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0RE | 51.580396 | -0.298169 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0RF | 51.58175 | -0.299201 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0ST | 51.582177 | -0.316317 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0TS | 51.58372 | -0.295533 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0TT | 51.584693 | -0.29502 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0TU | 51.58509 | -0.294515 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0UX | 51.583378 | -0.297971 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0YB | 51.585055 | -0.300102 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Brent | Kenton | HA3 0YD | 51.58573 | -0.300164 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 6AE | 51.588469 | -0.359319 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 6AF | 51.588327 | -0.358833 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 6HX | 51.588914 | -0.361584 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 6QJ | 51.593153 | -0.347081 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7DA | 51.579049 | -0.361491 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7DB | 51.578705 | -0.362023 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7DD | 51.580121 | -0.363589 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7DE | 51.580421 | -0.36316 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7DF | 51.58129 | -0.364211 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7LT | 51.578746 | -0.370118 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7NZ | 51.580157 | -0.370689 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7PZ | 51.583402 | -0.366719 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7QA | 51.582295 | -0.365402 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7QB | 51.582096 | -0.365943 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7QD | 51.583587 | -0.367766 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7QE | 51.584088 | -0.36756 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7QL | 51.586969 | -0.373029 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7QN | 51.586651 | -0.37343 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7SA | 51.584719 | -0.361244 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7SE | 51.585526 | -0.361056 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7SJ | 51.584336 | -0.362167 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7SR | 51.585091 | -0.362111 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7ST | 51.584758 | -0.361445 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7SU | 51.585668 | -0.361585 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7SW | 51.584585 | -0.362562 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | Harrow | North Harrow | HA2 7SX | 51.585615 | -0.36163 | |
GB | United Kingdom | EN | England | Greater London | This region doesn’t exist for this country | City of Westminster | London | EC4A 2AH | 51.513968 | -0.11127 |
Showing postal codes
Explore Our United Kingdom ZIP code coverage
United Kingdom's Postal Code Format
Postcode Format: AA9 9AA
- Alphanumeric format, 6–8 characters with a space before the last 3
- Two parts: outward code (area + district) and inward code (sector + unit)
- Extremely granular, often down to a single building (~15 addresses per unit)
- 1,795,653 postcodes covering 402 regions and 32,082 towns
Regional Examples:
- SW1A 1AA - London (England)
- EH1 1BB - Edinburgh (Scotland)
- CF10 1AA - Cardiff (Wales)
- BT1 5GS - Belfast (Northern Ireland)
Structure of Postcodes
- Format: Alphanumeric, 6–8 characters (e.g., SW1A 1AA).
- Hierarchical levels: Outward code = area + district; inward code = sector + unit.
- Key challenges: Postcodes are routing-oriented, not geographic; some span administrative boundaries. British Forces and island codes exist separately.
Management & Authority
- Primary postal authority: Royal Mail.
- Update frequency: Official updates weekly; redistributed quarterly via licensed partners.
- Coverage: Applies to England, Scotland, Wales, Northern Ireland; British Forces postcodes are managed separately.
Addressing Standards
- Common address format: [Double Dependent Locality] + [Dependent Locality] + [Post Town in capitals] + [Postcode].
- Administrative divisions used: None encoded; postcode data is linked to admin divisions externally.
- Notes: Dependent and double dependent localities are unique to Royal Mail routing and do not always match administrative geography.
Special Characteristics
- Micro-postcodes usually cover around 15 addresses (range 1–100).
- High change rate: 10,000+ postcode updates per quarter are common.
- Postal and administrative boundaries do not align cleanly, especially in border areas.
- Postcode data is licensed, not open; derivative datasets cannot be marketed as “official Royal Mail data.”
Our location dataset for United Kingdom
United Kingdom ZIP & Administrative boundaries
Comprehensive boundary data from GeoPostcodes for all United Kingdom postal codes, provinces, territories, and administrative divisions.
United Kingdom Administrative Divisions
The database follows a standardized and unified structure you can integrate without becoming an expert in each country’s unique administrative hierarchy.
Key Features:
- 247 countries
- Unified global hierarchy
- Up to 5 administrative levels
- Includes complex geographies
United Kingdom Address Format
Our database offers comprehensive address validation to reduce delivery errors and improve efficiency.
Coverage Statistics
1,795,653
Total ZIP Codes
402
Provinces & Territories
32,082
Cities & Towns
Available File Formats
Comma-separated values for
spreadsheet applications and data analysis tools
JavaScript Object Notation for
web applications and modern development
Extensible Markup Language for enterprise systems and legacy applications
Database-ready SQL scripts for
direct import into your systems
Data Dictionary
Field name | Field type | Description | Comments |
---|---|---|---|
ISO | Char(2) | ISO 3166-1 Country code | The ISO 3166-1 standard is published by the International Organization for Standardization (ISO) and defines a unique code for the name of each country. The country codes are represented as a two-letter code (alpha-2). |
Country | Char(50) | Country name | |
Language | Char(2) | Language code | When there are several official languages in the country, or for countries using a non-Latin alphabet, we provide the names in different languages. The language field contains the language code and allows you to select a specific version. |
Region1 Region2 Region3 Region4 | Char(80) | Administrative division level 1 Administrative division level 2 Administrative division level 3 Administrative division level 4 | These fields contain the name of administrative divisions for each available level. If not applicable, the value '-' will be indicated. |
Locality | Char(80) | Locality name | Contains the settlement name. The type of settlement may vary depending on the country (city, town, village, etc..). |
Postcode | Char(15) | ZIP / Postal code | In countries/places where there is no postal code in use, this field is left empty. The postcode structure varies for each country. |
Latitude Longitude | Double | Place coordinates (WGS84 coordinates) | These fields contain the geographic coordinates related to the specific locality and postal code of the record. The geographical position is usually precise to about one hundred meters and corresponds to the center of the locality. All our files are created using the World Geodetic System standard WGS 84. The corresponding SRID reference is EPSG:4326. |
Timezone | Char(30) | Time zone name (Olson) | Following the timezones defined in the IANA tz database (sometimes called Olson database). |
Why choose GeoPostcodes
Global coverage
Complete coverage across 247 countries, including hard-to-source geographies like China, Japan, Brazil, and Russia.
Highest quality
Built on extensive, authoritative sourcing with robust data engineering and quality control. Standardized and up-to-date.
Expert Consulting
With 15 years of experience, we guide your implementation and deliver data in the format that fits your system.
Global Location Databases
Comprehensive location data products serving businesses, and
organizations worldwide with accurate, up-to-date geographic information.

Postal Code Database
Global dataset containing all administrative divisions, cities and zip codes.
Key features
- 247 Countries
- 15,9M Coordinates
- 9,3M Postal Codes
- 401 Time zones
- 4M Cities and Towns
- 116K UNLOCODES
Specifications
- Coverage: Global
- Format: CSV, ASC, DAT, GML, GeoJSON, KML, Shapefile (SHP)
Boundary Data
A global dataset of polygons representing postal codes and administrative areas.
Key features
- 247 Countries
- Up to 6 levels
- 880K boundaries
- High-precision
- 316K Admin areas
- Visualization
Specifications
- Coverage: Global
- Format: GeoJSON, Geopackage, KML, Shapefile (SHP)

Population Database
Global population estimates at postal code and administrative level covering a span of 55 years: past, present, and future.
Key features
- 247 Countries
- 316K Admin areas
- 55 year span
- Yearly updates
- 9,3M ZIP codes
Specifications
- Coverage: International
- Format: CSV, ASC

Address Database
International dataset with all administrative areas, cities, streets, and relevant postal codes.
Key features
- 81 Countries
- 299 languages
- 26,5M streets
- 401 time zones
- 9.3M ZIP codes
- 4M cities
Specifications
- Coverage: International
- Format: CSV, ASC, DAT, GML, KML, Shapefile (SHP), GeoJSON
Use Cases for Postal Data
From address validation to market analysis, our postal code data powers
key operations
Address Validation
Capture accurate addresses for every country and territory in the world, in any language, and match local requirements.
Reporting and Business Intelligence
Ensure accurate and consistent reports across your organization. Enhance data analysis with location intelligence.
Logistics and Shipping
Design and optimize your distribution network, plan your pick-up and drop-off locations, reduce costs and improve visibility over your shipping.
Map and Visualization
Analyze complex trends and discover actionable insights. Build engaging and intuitive map-based data visualizations.
Sales and Marketing
Segment customers for site selection, analytics, geofencing, campaigns, mapping, and targeted ads.
Global Postal Code Coverage
247 countries and territories with standardized formatting and reliable geographic information.
Related Countries
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Frequently Asked Questions
A valid UK postcode consists of letters and numbers in a specific format, such as SW1A 1AA or M1 1AE. It helps identify precise locations for mail delivery.
A postcode in the UK is an alphanumeric code used to identify specific geographic areas for efficient mail sorting and delivery. It typically consists of two parts: the outward code and the inward code.
A UK English postcode is an alphanumeric code used for postal addressing in the United Kingdom. It follows formats like AB1 2CD, facilitating mail delivery and location identification.
The UK does not use zip codes; instead, it uses postcodes. For example, London’s Buckingham Palace has the postcode SW1A 1AA.
An outward code is the first part of a UK postcode, consisting of one or two letters followed by one or two numbers. It identifies the postcode area and postcode district.
For example, in the postcode “SW1A 1AA”, “SW1A” is the outward code. The outward code helps sort mail at the initial stages of the delivery process.
A postcode unit generally represents a specific area, usually a small group of addresses or even a single address.
It is the most detailed level in the UK postcode system, facilitating precise mail delivery. For example, “SW1A 1AA” is a postcode unit representing just one building or a few addresses on a street.
Insurance companies use alphanumeric codes in UK postcodes to determine the risk associated with a specific location. The codes help identify areas prone to theft, flooding, or other risks, allowing insurers to calculate premiums more accurately.
The precise location information from postcode units helps offer tailored insurance rates based on the specific risk factors of that area.
Outward codes are part of the broader postcode area system. They consist of the postcode district and are used to direct mail to the correct geographical region.
For instance, in the postcode “SW1A 1AA”, “SW1A” is the outward code. This code is crucial for the initial sorting of mail by the Royal Mail.
The sector and delivery point codes further break down the postcode district. The postcode sector code identifies the sector, such as “SW1A 1” in “SW1A 1AA.” The delivery point is even more specific, pinpointing individual addresses within that sector.
This level of detail ensures efficient and accurate mail delivery.
When a postcode has “only its own letters,” the letters in the outward or inward code are unique to that particular area or unit.
This uniqueness helps reduce errors in mail sorting and delivery. For example, the postcode unit “SW1A 1AA” has a unique combination of letters that accurately identifies a specific location.
Postcode districts are subdivisions within postcode areas. A postcode area is denoted by the initial one or two letters of the postcode, indicating a broad geographical region.
The postcode district further narrows down this region. For example, in “SW1A 1AA”, “SW” is the postcode area, and “1A” is the postcode district.