CO1 9 postcode sector in the CO1 district

CO1 9 is a sector of the CO1 district: every postcode that starts CO1 9. It has 68 postcodes in use, 43 of them large-user postcodes. 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 CO1 9 sector, by gigabit broadband

Map of every postcode in the CO1 9 sector, by gigabit broadband Of the 68 postcodes in the CO1 9 sector that ONS places, 1 can all get it and 67 have no Ofcom figure. Places named: Colchester, Marks Tey. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2 km. A12 CO1 9AE: no Ofcom figureCO1 9SN: gigabit for all ColchesterMarks Tey Map of every postcode in the CO1 9 sector, by gigabit broadband Of the 68 postcodes in the CO1 9 sector that ONS places, 1 can all get it and 67 have no Ofcom figure. Places named: Marks Tey. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2.5 km. A12A1124 Marks Tey
  • No home or business can get gigabit: 0
  • Some can get gigabit: 0
  • Every home and business can get gigabit: 1
  • Ofcom gives no figure: 67

Of the 68 postcodes in the CO1 9 sector that ONS places, 1 can all get it and 67 have no Ofcom figure.

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. No boundary is drawn. Where marks overlap, the one first in the key is drawn; the counts include every postcode.

Sources: ONS Postcode Directory, August 2026, loaded 20 October 2026; Ofcom Connected Nations, Connected Nations, Spring 2026; roads, rivers and built-up areas: Ordnance Survey open maps. 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.

Postcodes in CO1 9

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.

CO1 9AECO1 9AFCO1 9AJCO1 9AQCO1 9ARCO1 9ASCO1 9ATCO1 9AUCO1 9AWCO1 9BACO1 9BBCO1 9BDCO1 9BECO1 9BFCO1 9BGCO1 9BHCO1 9BWCO1 9FNCO1 9JRCO1 9LTCO1 9PTCO1 9PYCO1 9QFCO1 9QNCO1 9RBCO1 9RYCO1 9SACO1 9SBCO1 9SDCO1 9SECO1 9SFCO1 9SHCO1 9SJCO1 9SLCO1 9SNCO1 9SPCO1 9SQCO1 9SRCO1 9SSCO1 9STCO1 9SUCO1 9SWCO1 9SXCO1 9SYCO1 9SZCO1 9TACO1 9TBCO1 9TDCO1 9TECO1 9TFCO1 9TGCO1 9THCO1 9TJCO1 9TLCO1 9TNCO1 9TTCO1 9TZCO1 9UQCO1 9URCO1 9WGCO1 9YACO1 9YBCO1 9YECO1 9YPCO1 9ZBCO1 9ZECO1 9ZTCO1 9ZZ

Source: ONS Postcode Directory, August 2026, loaded 20 October 2026. Postcodes that have ended are not listed.

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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Where the facts on this page come from

Contains public sector information licensed under the Open Government Licence v3.0.

Licence: Open Government Licence v3.0.

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