EC3A 3 postcode sector in the EC3A district

EC3A 3 is a sector of the EC3A district: every postcode that starts EC3A 3. It has 4 postcodes in use, one of them a large-user postcode. A large-user postcode is one Royal Mail gives to a single address that gets a lot of mail.

Not sure what a sector is? UK postcode format explained.

Every postcode in the EC3A 3 sector, and which are new since 2020

Map of every postcode in the EC3A 3 sector, by new since 2020 Of the 4 postcodes in the EC3A 3 sector that ONS places, 4 were in use before 2020. Places named: City of London. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. A201A1A1211 EC3A 3AA: before 2020EC3A 3BP: before 2020EC3A 3DE: before 2020EC3A 3DH: before 2020 City of London Map of every postcode in the EC3A 3 sector, by new since 2020 Of the 4 postcodes in the EC3A 3 sector that ONS places, 4 were in use before 2020. Places named: City of London. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. City of London
  • New since 2020: 0
  • In use before 2020: 4

Of the 4 postcodes in the EC3A 3 sector that ONS places, 4 were in use before 2020.

Each mark is a postcode's centre point as ONS gives it, not a building. Press one to see its postcode and open its page. New since 2020 means it came into use in January 2020 or later. No boundary is drawn.

Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026, the centre point of each postcode; when each came into use: the same directory; roads, rivers and built-up areas: Contains OS data © Crown copyright and database right 2026. Drawn by us. Street map: Ordnance Survey, OS Open Zoomstack, Open Government Licence v3.0, drawn with MapLibre. How we use them

Postcodes in EC3A 3

Pick a postcode to see its council and MP, broadband, flood risk, what homes sell for, council tax, the nearest schools and stations, and crime around it.

EC3A 3AAEC3A 3BPEC3A 3DEEC3A 3DH

Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026. Postcodes that have ended are not listed. See all our data sources

What council am I in? The council, borough or local authority for a postcode, and the county council where there is one. What ward am I in? The ward for a postcode, with its council, constituency and parish.

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