EC3R postcode district

Postcodes and sectors

78 of the district's 396 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 51.51053, -0.08342, which locates the district, not a building.

Companies registered in EC3R

Companies House lists 2,117 companies with a registered office in EC3R; 1,732 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 EC3R

• Greater London
• London
• City of London
• City and County of the City of London
• Islington

Roads filed under EC3R

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.

• Botolph Alley
• Botolph Lane
• Buildings Fowkes'
• Byward Street
• Cross Lane
• Custom House Walk
• Dark House Walk
• Dunster Court
• Fish Street Hill
• Great Tower Street
• Harp Lane
• Hart Street
• Idol Lane
• London Street
• Lovat Lane
• Lower Thames Street
• Mark Lane
• Mincing Lane
• Monument Street
• New London Street
• Old Billingsgate Walk
• Old Watermen's Walk
• Petty Wales
• Pudding Lane
• St Dunstan's Alley
• St Dunstan's Hill
• St Dunstan's Lane
• St George's Lane
• St Mary at Hill
• Tower Place
• Water Lane

Check an address in EC3R

Check an address in EC3R

The same road list through the API, from the outward code alone:

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=EC3R" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about EC3R

What does an EC3R postcode tell you?

That the address lies in the EC3R district of the EC (East Central London) postcode area, and the place OS Open Names most often lists first for its postcodes is City of London. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 78 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 EC3R

• EC3M0.2 km
• EC3V0.3 km
• EC4R0.5 km
• EC3N0.5 km
• EC3A0.5 km
• EC4N0.6 km
• EC2N0.6 km
• EC2R0.8 km
• EC2V0.9 km
• EC2M0.9 km
• EC4V1.2 km
• EC4M1.2 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids