CO12 postcode district: Harwich and around, Essex

CO12 is a postcode district in Essex, with 644 postcodes in use in 4 sectors. It has postcodes in Harwich. Its council is Tendring.

Postcodes in use
644
Sectors
4
Council
Tendring
Places
Harwich

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

Every postcode in CO12, by flood risk

Map of every postcode in CO12, by flood risk Of the 644 postcodes in CO12 that ONS places, 34 have a home or business at high risk, 27 are at medium risk at worst, 49 are at low risk at worst, 66 are at very low risk only and 468 are not on the Environment Agency's at-risk list. One group of postcodes at high or medium risk is outlined: 44 postcodes at high or medium risk. Places named: Harwich. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2 km. A120 CO12 3AA: not on the flood risk listCO12 3AU: not on the flood risk listCO12 3BG: not on the flood risk listCO12 3DU: not on the flood risk listCO12 3EY: not on the flood risk listCO12 3FD: not on the flood risk listCO12 3FG: not on the flood risk listCO12 3FH: not on the flood risk listCO12 3FS: not on the flood risk listCO12 3GT: not on the flood risk listCO12 3HJ: not on the flood risk listCO12 3JR: not on the flood risk listCO12 3JY: not on the flood risk listCO12 3LR: not on the flood risk listCO12 3NN: not on the flood risk listCO12 3NP: not on the flood risk listCO12 3NQ: not on the flood risk listCO12 3NS: not on the flood risk listCO12 3PA: not on the flood risk listCO12 3PB: not on the flood risk listCO12 3PL: not on the flood risk listCO12 3PN: not on the flood risk listCO12 3PP: not on the flood risk listCO12 3QE: not on the flood risk listCO12 3QH: not on the flood risk listCO12 3QL: not on the flood risk listCO12 3QT: not on the flood risk listCO12 3QW: not on the flood risk listCO12 3RD: not on the flood risk listCO12 3RF: not on the flood risk listCO12 3RG: not on the flood risk listCO12 3RJ: not on the flood risk listCO12 3RN: not on the flood risk listCO12 3RP: not on the flood risk listCO12 3RS: not on the flood risk listCO12 3RW: not on the flood risk listCO12 3RY: not on the flood risk listCO12 3SA: not on the flood risk listCO12 3SB: not on the flood risk listCO12 3SG: not on the flood risk listCO12 3SJ: not on the flood risk listCO12 3SP: not on the flood risk listCO12 3SS: not on the flood risk listCO12 3TB: not on the flood risk listCO12 3TE: not on the flood risk listCO12 3TG: not on the flood risk listCO12 3TH: not on the flood risk listCO12 3TJ: not on the flood risk listCO12 3TL: not on the flood risk listCO12 3TQ: not on the flood risk listCO12 3TX: not on the flood risk listCO12 3UA: not on the flood risk listCO12 3UB: not on the flood risk listCO12 3UD: not on the flood risk listCO12 3UE: not on the flood risk listCO12 3UF: not on the flood risk listCO12 3UH: not on the flood risk listCO12 3UJ: not on the flood risk listCO12 3UL: not on the flood risk listCO12 4AA: not on the flood risk listCO12 4AB: not on the flood risk listCO12 4AF: not on the flood risk listCO12 4AG: not on the flood risk listCO12 4AH: not on the flood risk listCO12 4AJ: not on the flood risk listCO12 4AN: not on the flood risk listCO12 4AP: not on the flood risk listCO12 4AR: not on the flood risk listCO12 4AS: not on the flood risk listCO12 4AT: not on the flood risk listCO12 4AW: not on the flood risk listCO12 4AX: not on the flood risk listCO12 4AZ: not on the flood risk listCO12 4BA: not on the flood risk listCO12 4BG: not on the flood risk listCO12 4BJ: not on the flood risk listCO12 4BL: not on the flood risk listCO12 4BQ: not on the flood risk listCO12 4BS: not on the flood risk listCO12 4BT: not on the flood risk listCO12 4BU: not on the flood risk listCO12 4BX: not on the flood risk listCO12 4DA: not on the flood risk listCO12 4DD: not on the flood risk listCO12 4DE: not on the flood risk listCO12 4DF: not on the flood risk listCO12 4DN: not on the flood risk listCO12 4DP: not on the flood risk listCO12 4DR: not on the flood risk listCO12 4DS: not on the flood risk listCO12 4DT: not on the flood risk listCO12 4DU: not on the flood risk listCO12 4DW: not on the flood risk listCO12 4DX: not on the flood risk listCO12 4EA: not on the flood risk listCO12 4ED: not on the flood risk listCO12 4EE: not on the flood risk listCO12 4EF: not on the flood risk listCO12 4EG: not on the flood risk listCO12 4EP: not on the flood risk listCO12 4EQ: not on the flood risk listCO12 4ES: not on the flood risk listCO12 4ET: not on the flood risk listCO12 4EX: not on the flood risk listCO12 4FG: not on the flood risk listCO12 4FU: not on the flood risk listCO12 4FX: not on the flood risk listCO12 4FZ: not on the flood risk listCO12 4GN: not on the flood risk listCO12 4GT: not on the flood risk listCO12 4GU: not on the flood risk listCO12 4GW: not on the flood risk listCO12 4GX: not on the flood risk listCO12 4HA: not on the flood risk listCO12 4HB: not on the flood risk listCO12 4HD: not on the flood risk listCO12 4HE: not on the flood risk listCO12 4HF: not on the flood risk listCO12 4HG: not on the flood risk listCO12 4HJ: not on the flood risk listCO12 4HP: not on the flood risk listCO12 4HR: not on the flood risk listCO12 4HS: not on the flood risk listCO12 4HT: not on the flood risk listCO12 4HY: not on the flood risk listCO12 4JD: not on the flood risk listCO12 4JE: not on the flood risk listCO12 4JH: not on the flood risk listCO12 4JL: not on the flood risk listCO12 4JS: not on the flood risk listCO12 4JW: not on the flood risk listCO12 4JX: not on the flood risk listCO12 4JY: not on the flood risk listCO12 4LA: not on the flood risk listCO12 4LE: not on the flood risk listCO12 4LG: not on the flood risk listCO12 4LH: not on the flood risk listCO12 4LQ: not on the flood risk listCO12 4LS: not on the flood risk listCO12 4LT: not on the flood risk listCO12 4LU: not on the flood risk listCO12 4LW: not on the flood risk listCO12 4LZ: not on the flood risk listCO12 4NA: not on the flood risk listCO12 4NB: not on the flood risk listCO12 4ND: not on the flood risk listCO12 4NE: not on the flood risk listCO12 4NG: not on the flood risk listCO12 4NH: not on the flood risk listCO12 4NL: not on the flood risk listCO12 4NP: not on the flood risk listCO12 4NR: not on the flood risk listCO12 4NS: not on the flood risk listCO12 4NW: not on the flood risk listCO12 4PE: not on the flood risk listCO12 4PX: not on the flood risk listCO12 4QA: not on the flood risk listCO12 4QD: not on the flood risk listCO12 4QG: not on the flood risk listCO12 4QP: not on the flood risk listCO12 4QQ: not on the flood risk listCO12 4QR: not on the flood risk listCO12 4QS: not on the flood risk listCO12 4QT: not on the flood risk listCO12 4QY: not on the flood risk listCO12 4RD: not on the flood risk listCO12 4RE: not on the flood risk listCO12 4RF: not on the flood risk listCO12 4RG: not on the flood risk listCO12 4RH: not on the flood risk listCO12 4RJ: not on the flood risk listCO12 4RN: not on the flood risk listCO12 4RP: not on the flood risk listCO12 4RR: not on the flood risk listCO12 4RS: not on the flood risk listCO12 4RU: not on the flood risk listCO12 4RX: not on the flood risk listCO12 4SA: not on the flood risk listCO12 4TE: not on the flood risk listCO12 4TF: not on the flood risk listCO12 4TH: not on the flood risk listCO12 4TJ: not on the flood risk listCO12 4TL: not on the flood risk listCO12 4TP: not on the flood risk listCO12 4TR: not on the flood risk listCO12 4TS: not on the flood risk listCO12 4TT: not on the flood risk listCO12 4TU: not on the flood risk listCO12 4UA: not on the flood risk listCO12 4UB: not on the flood risk listCO12 4UE: not on the flood risk listCO12 4UF: not on the flood risk listCO12 4UG: not on the flood risk listCO12 4UJ: not on the flood risk listCO12 4UN: not on the flood risk listCO12 4UP: not on the flood risk listCO12 4UQ: not on the flood risk listCO12 4UR: not on the flood risk listCO12 4US: not on the flood risk listCO12 4UT: not on the flood risk listCO12 4UW: not on the flood risk listCO12 4UZ: not on the flood risk listCO12 4WE: not on the flood risk listCO12 4WG: not on the flood risk listCO12 4WH: not on the flood risk listCO12 4WL: not on the flood risk listCO12 4XA: not on the flood risk listCO12 4XB: not on the flood risk listCO12 4XD: not on the flood risk listCO12 4XE: not on the flood risk listCO12 4XG: not on the flood risk listCO12 4XL: not on the flood risk listCO12 4XN: not on the flood risk listCO12 4XP: not on the flood risk listCO12 4XS: not on the flood risk listCO12 4XT: not on the flood risk listCO12 4XU: not on the flood risk listCO12 4YA: not on the flood risk listCO12 4YB: not on the flood risk listCO12 5AA: not on the flood risk listCO12 5AB: not on the flood risk listCO12 5AD: not on the flood risk listCO12 5AE: not on the flood risk listCO12 5AG: not on the flood risk listCO12 5AH: not on the flood risk listCO12 5AJ: not on the flood risk listCO12 5AL: not on the flood risk listCO12 5AN: not on the flood risk listCO12 5AP: not on the flood risk listCO12 5AT: not on the flood risk listCO12 5AU: not on the flood risk listCO12 5AX: not on the flood risk listCO12 5AZ: not on the flood risk listCO12 5BA: not on the flood risk listCO12 5BB: not on the flood risk listCO12 5BD: not on the flood risk listCO12 5BE: not on the flood risk listCO12 5BG: not on the flood risk listCO12 5BL: not on the flood risk listCO12 5BP: not on the flood risk listCO12 5BS: not on the flood risk listCO12 5BT: not on the flood risk listCO12 5BW: not on the flood risk listCO12 5BX: not on the flood risk listCO12 5BY: not on the flood risk listCO12 5BZ: not on the flood risk listCO12 5DA: not on the flood risk listCO12 5DB: not on the flood risk listCO12 5DD: not on the flood risk listCO12 5DE: not on the flood risk listCO12 5DF: not on the flood risk listCO12 5DG: not on the flood risk listCO12 5DH: not on the flood risk listCO12 5DL: not on the flood risk listCO12 5DN: not on the flood risk listCO12 5DP: not on the flood risk listCO12 5DQ: not on the flood risk listCO12 5DS: not on the flood risk listCO12 5DT: not on the flood risk listCO12 5DY: not on the flood risk listCO12 5EA: not on the flood risk listCO12 5EB: not on the flood risk listCO12 5ED: not on the flood risk listCO12 5EE: not on the flood risk listCO12 5EH: not on the flood risk listCO12 5EJ: not on the flood risk listCO12 5EL: not on the flood risk listCO12 5EN: not on the flood risk listCO12 5EP: not on the flood risk listCO12 5EQ: not on the flood risk listCO12 5ER: not on the flood risk listCO12 5ES: not on the flood risk listCO12 5EU: not on the flood risk listCO12 5EW: not on the flood risk listCO12 5EZ: not on the flood risk listCO12 5FA: not on the flood risk listCO12 5FB: not on the flood risk listCO12 5FD: not on the flood risk listCO12 5FF: not on the flood risk listCO12 5FG: not on the flood risk listCO12 5FH: not on the flood risk listCO12 5FJ: not on the flood risk listCO12 5FL: not on the flood risk listCO12 5FP: not on the flood risk listCO12 5FQ: not on the flood risk listCO12 5FR: not on the flood risk listCO12 5FT: not on the flood risk listCO12 5HE: not on the flood risk listCO12 5HF: not on the flood risk listCO12 5HG: not on the flood risk listCO12 5HJ: not on the flood risk listCO12 5JA: not on the flood risk listCO12 5JB: not on the flood risk listCO12 5JD: not on the flood risk listCO12 5JE: not on the flood risk listCO12 5JF: not on the flood risk listCO12 5JG: not on the flood risk listCO12 5JH: not on the flood risk listCO12 5JL: not on the flood risk listCO12 5JN: not on the flood risk listCO12 5JP: not on the flood risk listCO12 5JR: not on the flood risk listCO12 5JS: not on the flood risk listCO12 5JT: not on the flood risk listCO12 5JU: not on the flood risk listCO12 5JX: not on the flood risk listCO12 5JY: not on the flood risk listCO12 5JZ: not on the flood risk listCO12 5LD: not on the flood risk listCO12 5LG: not on the flood risk listCO12 5LH: not on the flood risk listCO12 5LL: not on the flood risk listCO12 5LN: not on the flood risk listCO12 5LP: not on the flood risk listCO12 5LR: not on the flood risk listCO12 5LS: not on the flood risk listCO12 5LT: not on the flood risk listCO12 5LU: not on the flood risk listCO12 5LY: not on the flood risk listCO12 5LZ: not on the flood risk listCO12 5NA: not on the flood risk listCO12 5NB: not on the flood risk listCO12 5ND: not on the flood risk listCO12 5NF: not on the flood risk listCO12 5NH: not on the flood risk listCO12 5NJ: not on the flood risk listCO12 5NL: not on the flood risk listCO12 5NN: not on the flood risk listCO12 3AG: very low flood risk onlyCO12 3AP: very low flood risk onlyCO12 3AL: very low flood risk onlyCO12 3BA: very low flood risk onlyCO12 3EL: very low flood risk onlyCO12 3NR: very low flood risk onlyCO12 4SL: very low flood risk onlyCO12 3RZ: very low flood risk onlyCO12 3TN: very low flood risk onlyCO12 3TP: very low flood risk onlyCO12 3TR: very low flood risk onlyCO12 3TW: very low flood risk onlyCO12 4BH: very low flood risk onlyCO12 4FE: very low flood risk onlyCO12 4FH: very low flood risk onlyCO12 4GA: very low flood risk onlyCO12 4GD: very low flood risk onlyCO12 4GE: very low flood risk onlyCO12 4GG: very low flood risk onlyCO12 4JU: very low flood risk onlyCO12 4LD: very low flood risk onlyCO12 4LF: very low flood risk onlyCO12 4NX: very low flood risk onlyCO12 4PA: very low flood risk onlyCO12 4PB: very low flood risk onlyCO12 4PD: very low flood risk onlyCO12 4PH: very low flood risk onlyCO12 4PL: very low flood risk onlyCO12 4PQ: very low flood risk onlyCO12 4PR: very low flood risk onlyCO12 4PS: very low flood risk onlyCO12 4QB: very low flood risk onlyCO12 4SP: very low flood risk onlyCO12 4SS: very low flood risk onlyCO12 4SX: very low flood risk onlyCO12 4UU: very low flood risk onlyCO12 4UY: very low flood risk onlyCO12 4XJ: very low flood risk onlyCO12 5BH: very low flood risk onlyCO12 5ET: very low flood risk onlyCO12 5EX: very low flood risk onlyCO12 5HD: very low flood risk onlyCO12 5HH: very low flood risk onlyCO12 5HN: very low flood risk onlyCO12 5HR: very low flood risk onlyCO12 5HW: very low flood risk onlyCO12 5JW: very low flood risk onlyCO12 5LF: very low flood risk onlyCO12 5LJ: very low flood risk onlyCO12 3AT: low flood risk at worstCO12 3BJ: low flood risk at worstCO12 3FR: low flood risk at worstCO12 3GS: low flood risk at worstCO12 3HL: low flood risk at worstCO12 3HR: low flood risk at worstCO12 3HU: low flood risk at worstCO12 3JA: low flood risk at worstCO12 3JD: low flood risk at worstCO12 3LB: low flood risk at worstCO12 3LD: low flood risk at worstCO12 3LT: low flood risk at worstCO12 3NH: low flood risk at worstCO12 3SD: low flood risk at worstCO12 3SN: low flood risk at worstCO12 3SU: low flood risk at worstCO12 3SW: low flood risk at worstCO12 3SX: low flood risk at worstCO12 3SZ: low flood risk at worstCO12 3TA: low flood risk at worstCO12 3TS: low flood risk at worstCO12 3TT: low flood risk at worstCO12 3TZ: low flood risk at worstCO12 4EH: low flood risk at worstCO12 5EY: low flood risk at worstCO12 3BD: medium flood risk at worstCO12 3BN: medium flood risk at worstCO12 3BW: medium flood risk at worstCO12 3DA: medium flood risk at worstCO12 3LJ: medium flood risk at worstCO12 3ES: medium flood risk at worstCO12 3LZ: medium flood risk at worstCO12 3DT: medium flood risk at worstCO12 3ND: medium flood risk at worstCO12 3HN: medium flood risk at worstCO12 3LP: medium flood risk at worstCO12 3RX: medium flood risk at worstCO12 4EL: medium flood risk at worstCO12 5NE: medium flood risk at worstCO12 3BP: high flood riskCO12 3DD: high flood riskCO12 3DG: high flood riskCO12 3EA: high flood riskCO12 3EN: high flood riskCO12 3EJ: high flood riskCO12 3JJ: high flood riskCO12 3HB: high flood riskCO12 3FN: high flood riskCO12 3HF: high flood riskCO12 3LX: high flood riskCO12 3NF: high flood riskCO12 3NL: high flood riskCO12 3SF: high flood riskCO12 3ST: high flood riskCO12 4EN: high flood riskCO12 4NZ: high flood riskCO12 4PT: high flood riskCO12 5BN: high flood riskCO12 5BQ: high flood riskCO12 5HA: high flood riskCO12 5HB: high flood riskCO12 5HL: high flood riskCO12 5HP: high flood riskCO12 5JJ: high flood riskCO12 5LE: high flood risk Harwich 44 postcodes at high or medium risk, outlined: this goes to CO12 3HH, the one with most homes and businesses at high risk44 postcodes at high or medium risk Map of every postcode in CO12, by flood risk Of the 644 postcodes in CO12 that ONS places, 34 have a home or business at high risk, 27 are at medium risk at worst, 49 are at low risk at worst, 66 are at very low risk only and 468 are not on the Environment Agency's at-risk list. One group of postcodes at high or medium risk is outlined: 44 postcodes at high or medium risk. Places named: Harwich. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2.5 km. Harwich
  • A home or business at high risk: 34
  • At medium risk at worst: 27
  • At low risk at worst: 49
  • At very low risk only: 66
  • Not on the at-risk list: 468
  • Outline: where 5 or more postcodes at high or medium risk lie together

Of the 644 postcodes in CO12 that ONS places, 34 have a home or business at high risk, 27 are at medium risk at worst, 49 are at low risk at worst, 66 are at very low risk only and 468 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 51.9311, longitude 1.2522. 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

34 postcodes here have a home or business at high risk. These are the 12 with the most homes and businesses at that risk.

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

CO12 3HH22 at high riskCO12 3LU19 at high riskCO12 3NJ10 at high riskCO12 3FP9 at high riskCO12 3LX8 at high riskCO12 3EA6 at high riskCO12 3ST6 at high riskCO12 3NL5 at high riskCO12 5BQ5 at high riskCO12 3HF5 at high riskCO12 3EN5 at high riskCO12 3LY4 at high risk

Where the postcodes at high or medium risk lie together

  • 44 postcodes at high or medium risk, outlined on the map. CO12 3HH, is the one with most homes and businesses at high risk.

What broadband can you get in CO12?

Ofcom reports on 631 of the 644 postcodes in CO12. At 420 of them every home and business can get gigabit broadband.

Postcodes where every home can get gigabit420 of 631
Postcodes where every home can get superfast587 of 631

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 CO12 at risk of flooding?

176 of the 644 postcodes in CO12 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 534 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 176 of 644 postcodes High: 143Medium: 391Low: 1,188Very low: 1,140

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 CO12?

Homes in CO12 sold for a typical £241,000 in the 12 months to August 2026, across 298 sales, down 5.5% on the 12 months before, HM Land Registry's figures show.

£241,000 typical price, the 12 months to August 2026
£255,000 12 months to August 2025
▼ down 5.5% on the 12 months before
  • Detached £343,000 90 sales
  • Semi-detached £243,625 88 sales
  • Terraced £195,000 95 sales
  • Flat or maisonette £137,000 25 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 CO12

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

CO12 3226 postcodesCO12 4267 postcodesCO12 5147 postcodesCO12 94 postcodes
UK postcode format explained

Places in CO12

Towns and villages with postcodes in CO12, and how many each has here.

Harwich postcodes,494

Who covers CO12

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

  • Harwich and North Essex559
  • Clacton85

Police force areas

  • Essex644

Next to CO12

CO11 postcode district CO13 postcode district All CO districts Harwich postcodes

"Next to" is by number: the districts before and after CO12 in the CO area.

Check a postcode

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