CO1 postcode district: Colchester and around, Essex

CO1 is a postcode district in Essex, with 593 postcodes in use in 3 sectors. It has postcodes in Colchester and Tiptree. Its council is Colchester.

Postcodes in use
593
Sectors
3
Council
Colchester
Places
2 places

Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026. See all our data sources

Every postcode in CO1, by flood risk

Map of every postcode in CO1, by flood risk Of the 593 postcodes in CO1 that ONS places, 4 have a home or business at high risk, 20 are at medium risk at worst, 37 are at low risk at worst, 28 are at very low risk only and 504 are not on the Environment Agency's at-risk list. 3 groups of postcodes at high or medium risk are outlined: 8 postcodes at high or medium risk; 6 postcodes at high or medium risk; 5 postcodes at high or medium risk. Places named: Colchester, Berechurch, Marks Tey. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2.5 km. A12 CO1 1AA: not on the flood risk listCO1 1AG: not on the flood risk listCO1 1AP: not on the flood risk listCO1 1AQ: not on the flood risk listCO1 1AT: not on the flood risk listCO1 1AZ: not on the flood risk listCO1 1BE: not on the flood risk listCO1 1BG: not on the flood risk listCO1 1BT: not on the flood risk listCO1 1BX: not on the flood risk listCO1 1BZ: not on the flood risk listCO1 1DA: not on the flood risk listCO1 1DB: not on the flood risk listCO1 1DF: not on the flood risk listCO1 1DN: not on the flood risk listCO1 1DS: not on the flood risk listCO1 1DZ: not on the flood risk listCO1 1EG: not on the flood risk listCO1 1EJ: not on the flood risk listCO1 1EY: not on the flood risk listCO1 1FB: not on the flood risk listCO1 1FF: not on the flood risk listCO1 1FQ: not on the flood risk listCO1 1FW: not on the flood risk listCO1 1GJ: not on the flood risk listCO1 1GP: not on the flood risk listCO1 1GY: not on the flood risk listCO1 1HU: not on the flood risk listCO1 1JH: not on the flood risk listCO1 1JJ: not on the flood risk listCO1 1JW: not on the flood risk listCO1 1JX: not on the flood risk listCO1 1LD: not on the flood risk listCO1 1LJ: not on the flood risk listCO1 1LS: not on the flood risk listCO1 1LU: not on the flood risk listCO1 1NF: not on the flood risk listCO1 1NH: not on the flood risk listCO1 1NJ: not on the flood risk listCO1 1NT: not on the flood risk listCO1 1NZ: not on the flood risk listCO1 1PR: not on the flood risk listCO1 1PT: not on the flood risk listCO1 1RH: not on the flood risk listCO1 1RY: not on the flood risk listCO1 1SB: not on the flood risk listCO1 1SG: not on the flood risk listCO1 1SH: not on the flood risk listCO1 1SN: not on the flood risk listCO1 1SU: not on the flood risk listCO1 1TJ: not on the flood risk listCO1 1TL: not on the flood risk listCO1 1UE: not on the flood risk listCO1 1UL: not on the flood risk listCO1 1UN: not on the flood risk listCO1 1UP: not on the flood risk listCO1 1UR: not on the flood risk listCO1 1UT: not on the flood risk listCO1 1UZ: not on the flood risk listCO1 1WQ: not on the flood risk listCO1 1XD: not on the flood risk listCO1 1XF: not on the flood risk listCO1 1XN: not on the flood risk listCO1 1XR: not on the flood risk listCO1 1XW: not on the flood risk listCO1 1XX: not on the flood risk listCO1 1YA: not on the flood risk listCO1 1YD: not on the flood risk listCO1 1YH: not on the flood risk listCO1 1YN: not on the flood risk listCO1 1ZS: not on the flood risk listCO1 1ZY: not on the flood risk listCO1 2AA: not on the flood risk listCO1 2AD: not on the flood risk listCO1 2AG: not on the flood risk listCO1 2AH: not on the flood risk listCO1 2AN: not on the flood risk listCO1 2AP: not on the flood risk listCO1 2AR: not on the flood risk listCO1 2AS: not on the flood risk listCO1 2AU: not on the flood risk listCO1 2AX: not on the flood risk listCO1 2AY: not on the flood risk listCO1 2BD: not on the flood risk listCO1 2BE: not on the flood risk listCO1 2BH: not on the flood risk listCO1 2BL: not on the flood risk listCO1 2BU: not on the flood risk listCO1 2BX: not on the flood risk listCO1 2BY: not on the flood risk listCO1 2DG: not on the flood risk listCO1 2DL: not on the flood risk listCO1 2DN: not on the flood risk listCO1 2DR: not on the flood risk listCO1 2DT: not on the flood risk listCO1 2DU: not on the flood risk listCO1 2EB: not on the flood risk listCO1 2EP: not on the flood risk listCO1 2ES: not on the flood risk listCO1 2ET: not on the flood risk listCO1 2EW: not on the flood risk listCO1 2EY: not on the flood risk listCO1 2EZ: not on the flood risk listCO1 2FA: not on the flood risk listCO1 2FG: not on the flood risk listCO1 2FJ: not on the flood risk listCO1 2FP: not on the flood risk listCO1 2FR: not on the flood risk listCO1 2FS: not on the flood risk listCO1 2FT: not on the flood risk listCO1 2FY: not on the flood risk listCO1 2GD: not on the flood risk listCO1 2GF: not on the flood risk listCO1 2GP: not on the flood risk listCO1 2GQ: not on the flood risk listCO1 2GS: not on the flood risk listCO1 2GW: not on the flood risk listCO1 2GZ: not on the flood risk listCO1 2HA: not on the flood risk listCO1 2HD: not on the flood risk listCO1 2HF: not on the flood risk listCO1 2HG: not on the flood risk listCO1 2HJ: not on the flood risk listCO1 2HN: not on the flood risk listCO1 2HP: not on the flood risk listCO1 2HR: not on the flood risk listCO1 2HS: not on the flood risk listCO1 2HT: not on the flood risk listCO1 2JB: not on the flood risk listCO1 2JH: not on the flood risk listCO1 2JP: not on the flood risk listCO1 2JQ: not on the flood risk listCO1 2JR: not on the flood risk listCO1 2JT: not on the flood risk listCO1 2JX: not on the flood risk listCO1 2JZ: not on the flood risk listCO1 2LA: not on the flood risk listCO1 2LF: not on the flood risk listCO1 2LH: not on the flood risk listCO1 2LJ: not on the flood risk listCO1 2LR: not on the flood risk listCO1 2LT: not on the flood risk listCO1 2LY: not on the flood risk listCO1 2LZ: not on the flood risk listCO1 2NF: not on the flood risk listCO1 2NN: not on the flood risk listCO1 2PF: not on the flood risk listCO1 2PQ: not on the flood risk listCO1 2PY: not on the flood risk listCO1 2QA: not on the flood risk listCO1 2QS: not on the flood risk listCO1 2QU: not on the flood risk listCO1 2RG: not on the flood risk listCO1 2RH: not on the flood risk listCO1 2RR: not on the flood risk listCO1 2RX: not on the flood risk listCO1 2SB: not on the flood risk listCO1 2SN: not on the flood risk listCO1 2SU: not on the flood risk listCO1 2SX: not on the flood risk listCO1 2TH: not on the flood risk listCO1 2TN: not on the flood risk listCO1 2UL: not on the flood risk listCO1 2UP: not on the flood risk listCO1 2UU: not on the flood risk listCO1 2UW: not on the flood risk listCO1 2UY: not on the flood risk listCO1 2WA: not on the flood risk listCO1 2WF: not on the flood risk listCO1 2WT: not on the flood risk listCO1 2XA: not on the flood risk listCO1 2ZL: not on the flood risk listCO1 2ZN: not on the flood risk listCO1 9AE: not on the flood risk listCO1 1RB: very low flood risk onlyCO1 2NH: very low flood risk onlyCO1 2QX: very low flood risk onlyCO1 2GL: very low flood risk onlyCO1 2GU: very low flood risk onlyCO1 2GX: very low flood risk onlyCO1 2GY: very low flood risk onlyCO1 2NB: very low flood risk onlyCO1 2NW: very low flood risk onlyCO1 2TE: very low flood risk onlyCO1 2SJ: very low flood risk onlyCO1 2SL: very low flood risk onlyCO1 2SP: very low flood risk onlyCO1 2SQ: very low flood risk onlyCO1 2ST: very low flood risk onlyCO1 2TP: very low flood risk onlyCO1 2UJ: very low flood risk onlyCO1 2UR: very low flood risk onlyCO1 1EA: low flood risk at worstCO1 1QT: low flood risk at worstCO1 1GD: low flood risk at worstCO1 1QE: low flood risk at worstCO1 1QX: low flood risk at worstCO1 2GB: low flood risk at worstCO1 1RA: low flood risk at worstCO1 1RD: low flood risk at worstCO1 1RR: low flood risk at worstCO1 1RU: low flood risk at worstCO1 1RZ: low flood risk at worstCO1 1WW: low flood risk at worstCO1 1XS: low flood risk at worstCO1 1ZP: low flood risk at worstCO1 2EX: low flood risk at worstCO1 2RD: low flood risk at worstCO1 2RF: low flood risk at worstCO1 2RJ: low flood risk at worstCO1 2RZ: low flood risk at worstCO1 2TJ: low flood risk at worstCO1 2TR: low flood risk at worstCO1 2YL: low flood risk at worstCO1 2ZD: low flood risk at worstCO1 2ZF: low flood risk at worstCO1 1XL: medium flood risk at worstCO1 1QD: medium flood risk at worstCO1 1RS: medium flood risk at worstCO1 1UU: medium flood risk at worstCO1 2QY: medium flood risk at worstCO1 2TX: medium flood risk at worstCO1 2RA: medium flood risk at worstCO1 2UD: medium flood risk at worstCO1 2UQ: medium flood risk at worstCO1 2YN: medium flood risk at worstCO1 2YR: medium flood risk at worstCO1 2YT: medium flood risk at worstCO1 2YW: medium flood risk at worstCO1 2ZG: medium flood risk at worstCO1 1QG: high flood riskCO1 1XZ: high flood riskCO1 2SD: high flood risk ColchesterBerechurchMarks Tey 6 postcodes at high or medium risk, outlined: this goes to CO1 2YU, the one with most homes and businesses at high risk6 postcodes at high or medium risk5 postcodes at high or medium risk, outlined: this goes to CO1 1XZ, the one with most homes and businesses at high risk5 postcodes at high or medium risk Map of every postcode in CO1, by flood risk Of the 593 postcodes in CO1 that ONS places, 4 have a home or business at high risk, 20 are at medium risk at worst, 37 are at low risk at worst, 28 are at very low risk only and 504 are not on the Environment Agency's at-risk list. 3 groups of postcodes at high or medium risk are outlined: 8 postcodes at high or medium risk; 6 postcodes at high or medium risk; 5 postcodes at high or medium risk. Places named: Colchester, Berechurch, Marks Tey. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2.5 km. A12A1124 ColchesterBerechurchMarks Tey
  • A home or business at high risk: 4
  • At medium risk at worst: 20
  • At low risk at worst: 37
  • At very low risk only: 28
  • Not on the at-risk list: 504
  • Outline: where 5 or more postcodes at high or medium risk lie together

Of the 593 postcodes in CO1 that ONS places, 4 have a home or business at high risk, 20 are at medium risk at worst, 37 are at low risk at worst, 28 are at very low risk only and 504 are not on the Environment Agency's at-risk list.

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. A dashed outline shows where 5 or more lie within 150 metres of each other. It is not a boundary, and no boundary is drawn. Where marks overlap, the one first in the key is drawn; the counts include every postcode.

The middle of its postcodes: latitude 51.8845, longitude 0.8974. Open this area on OpenStreetMap

Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026, the centre point of each postcode; flood risk: Environment Agency, published 6 July 2026; 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

The postcodes at high risk

Beside each: how many of its homes and businesses the Environment Agency puts at that risk.

CO1 1XZ8 at high riskCO1 1QG3 at high riskCO1 1QJ1 at high riskCO1 2SD1 at high risk

Where the postcodes at high or medium risk lie together

  • 8 postcodes at high or medium risk, outlined on the map. CO1 2UF, is the one with most homes and businesses at high risk.
  • 6 postcodes at high or medium risk, outlined on the map. CO1 2YU, is the one with most homes and businesses at high risk.
  • 5 postcodes at high or medium risk, outlined on the map. CO1 1XZ, is the one with most homes and businesses at high risk.

What broadband can you get in CO1?

Ofcom reports on 513 of the 593 postcodes in CO1. At 291 of them every home and business can get gigabit broadband.

Postcodes where every home can get gigabit291 of 513
Postcodes where every home can get superfast418 of 513

Ofcom gives each postcode's share of homes and businesses, not how many there are, so these count postcodes. Each postcode page has its own figures. A provider's checker answers for one address.

Check one address on Ofcom's checker

Source: Ofcom, Connected Nations, Spring 2026, data for January 2026, Open Government Licence v3.0. How we use it

Is CO1 at risk of flooding?

89 of the 593 postcodes in CO1 have a home or business in an area at risk of flooding from rivers or the sea, the Environment Agency says. At those, it puts 244 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 89 of 593 postcodes High: 13Medium: 231Low: 626Very low: 311

High: 3.3% or more a year (1 in 30). Medium: 1% to 3.3% a year. Low: 0.1% to 1% a year. Very low: under 0.1% a year (1 in 1,000). Each band is the chance of flooding in any one year.

Homes and businesses in an area at risk of flooding from rivers or the sea, as the Environment Agency counts them, added up over the postcodes. It is for the land, not each building, and leaves out surface water, groundwater and sewers. Each postcode page has its own figures and its flood warning areas.

Source: Environment Agency, Risk of Flooding from Rivers and Sea (postcodes in areas at risk), published 6 July 2026, Open Government Licence v3.0. How we use it

What do homes sell for in CO1?

Homes in CO1 sold for a typical £237,750 in the 12 months to August 2026, across 226 sales, up 1.2% on the 12 months before, HM Land Registry's figures show.

£237,750 typical price, the 12 months to August 2026
£235,000 12 months to August 2025
▲ up 1.2% on the 12 months before
  • Detached £362,500 20 sales
  • Semi-detached £315,000 49 sales
  • Terraced £245,000 87 sales
  • Flat or maisonette £150,000 70 sales

Each bar is that kind's typical price, against the most expensive kind here.

Standard sales of homes at market value. A typical price is the median, the middle sale. Sales take weeks to be registered, so the last month or two are incomplete. Each postcode page gives the figure for its own postcode sector.

Source: HM Land Registry Price Paid Data, files dated 28 September 2026. Contains HM Land Registry data © Crown copyright and database right 2021. This data is licensed under the Open Government Licence v3.0. How we use it

Postcodes in CO1

Pick a sector, then a postcode. A sector is the district plus the next digit.

CO1 1234 postcodesCO1 2291 postcodesCO1 968 postcodes
UK postcode format explained

Places in CO1

Towns and villages with postcodes in CO1, and how many each has here.

Colchester postcodes,555Tiptree postcodes,38

Who covers CO1

How many of the district's postcodes in use fall under each council, constituency and police force area.

Councils

What council am I in?

Constituencies

  • Colchester499
  • Harwich and North Essex56
  • Witham38

Police force areas

  • Essex593

Next to CO1

CO2 postcode district All CO districts Colchester postcodes

"Next to" is by number: the district after CO1 in the CO area.

Check a postcode

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