B3 postcode district
B3, in the B (Birmingham) postcode area, has 189 live and 530 terminated postcodes in the ONS Postcode Directory of August 2026, and OS Open Names files 36 roads under it.
| postcode area | B (Birmingham) |
|---|---|
| live postcodes | 189 |
| terminated postcodes | 530 |
| sectors | 3 |
| roads listed | 36 |
| companies registered | 7,169 |
| centroid | 52.48374, -1.90375 |
| directory release | 2026-08 |
Postcodes and sectors
189 of the district's 719 postcodes are live in the ONS Postcode Directory of August 2026. A postcode directory says whether a code is in use, never who is there. The live postcodes centre on 52.48374, -1.90375, which locates the district, not a building.
| sector | live | terminated |
|---|---|---|
| B3 1 | 101 | 170 |
| B3 2 | 46 | 203 |
| B3 3 | 42 | 157 |
Companies registered in B3
Companies House lists 7,169 companies with a registered office in B3; 4,719 of them at addresses shared by 25 or more companies (1 October 2026 snapshot). 25 is the count at which the address lookup reports a company cluster.
Places OS Open Names lists for B3
- Birmingham
- West Midlands
Roads filed under B3
Named roads first, then numbered ones. A road is filed under one district even where it runs through several, so a street missing here may be listed under a neighbouring district — which is why the address lookup never calls a British street absent. Great Britain has no open register of buildings, so a listed road never means a building on it exists.
- Barwick Street
- Brook Street
- Caroline Street
- Centenary Way
- Chamberlain Square
- Charlotte Street
- Christ Church Passage
- Church Street
- Colmore Row
- Congreve Passage
- Cornwall Street
- Cox Street
- Eden Place
- Edmund Street
- Fleet Street
- George Street
- Great Charles Street Queensway
- Great Western Arcade
- Holland Street
- James Street
- Lionel Street
- Livery Street
- Ludgate Hill
- Margaret Street
- Mary Ann Street
- Mary Street
- Newhall Street
- New Market Street
- Northwood Street
- Queensway
- St Paul's Square
- St Philip's Place
- Summer Row
- Waterloo Passage
- Water Street
- A4400
Check an address in B3
The same road list through the API, from the outward code alone:
curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=B3" \ -H "Authorization: Bearer $SPAW_KEY"
Common questions about B3
- What does a B3 postcode tell you?
- That the address lies in the B3 district of the B (Birmingham) postcode area, and the place OS Open Names most often lists first for its postcodes is Birmingham. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 189 live postcodes.
Where the counts come from
- ons-postcode-directory · version 2026-08 · Contains ONS, OS and Royal Mail data © Crown copyright and database right 2026, Open Government Licence v3.0. Northern Ireland postcodes are excluded: their reuse needs a Land & Property Services licence.
- os-open-names · version 2026-11-01 · Contains OS data © Crown copyright and database right 2026, Open Government Licence v3.0.
- uk-companies-house · version 2026-10-01 · Companies House free company data product, Open Government Licence v3.0
What each figure means, and what a district page never says, is set out in Reading a British postcode district page; the glossary defines a postcode district, a postcode area, a postcode directory and a street register.
Data synced on 2026-11-01: the newest version among the datasets listed above.
Districts nearest B3
- B10.6 km
- B20.6 km
- B40.8 km
- B191.5 km
- B181.7 km
- B51.7 km
- B162.2 km
- B152.3 km
- B72.4 km
- B62.7 km
- B122.8 km
- B213.6 km
- Every district
- How a British address is written
- Check any address
distance between the districts' centroids
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