CM17 postcode district: Harlow and around, Essex

CM17 is a postcode district in Essex, with 529 postcodes in use in 2 sectors. It has postcodes in Harlow. It is split between 3 councils: Harlow (435 postcodes), Epping Forest (93) and Uttlesford (1).

Postcodes in use
529
Sectors
2
Councils
3 councils
Places
Harlow

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

Every postcode in CM17, by flood risk

Map of every postcode in CM17, by flood risk Of the 529 postcodes in CM17 that ONS places, 4 have a home or business at high risk, 2 are at low risk at worst and 523 are not on the Environment Agency's at-risk list. Places named: Old Harlow, Church Langley North & Newhall. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 1 km. CM17 0AA: not on the flood risk listCM17 0AB: not on the flood risk listCM17 0AD: not on the flood risk listCM17 0AE: not on the flood risk listCM17 0AF: not on the flood risk listCM17 0AG: not on the flood risk listCM17 0AL: not on the flood risk listCM17 0AN: not on the flood risk listCM17 0AP: not on the flood risk listCM17 0AQ: not on the flood risk listCM17 0AR: not on the flood risk listCM17 0AS: not on the flood risk listCM17 0AT: not on the flood risk listCM17 0AX: not on the flood risk listCM17 0AY: not on the flood risk listCM17 0AZ: not on the flood risk listCM17 0BA: not on the flood risk listCM17 0BB: not on the flood risk listCM17 0BD: not on the flood risk listCM17 0BE: not on the flood risk listCM17 0BG: not on the flood risk listCM17 0BH: not on the flood risk listCM17 0BJ: not on the flood risk listCM17 0BN: not on the flood risk listCM17 0BP: not on the flood risk listCM17 0BT: not on the flood risk listCM17 0BU: not on the flood risk listCM17 0BW: not on the flood risk listCM17 0BX: not on the flood risk listCM17 0BY: not on the flood risk listCM17 0BZ: not on the flood risk listCM17 0DA: not on the flood risk listCM17 0DG: not on the flood risk listCM17 0DH: not on the flood risk listCM17 0DJ: not on the flood risk listCM17 0DL: not on the flood risk listCM17 0DN: not on the flood risk listCM17 0DR: not on the flood risk listCM17 0DS: not on the flood risk listCM17 0DT: not on the flood risk listCM17 0DU: not on the flood risk listCM17 0DX: not on the flood risk listCM17 0DY: not on the flood risk listCM17 0EA: not on the flood risk listCM17 0EB: not on the flood risk listCM17 0ED: not on the flood risk listCM17 0EE: not on the flood risk listCM17 0EF: not on the flood risk listCM17 0EH: not on the flood risk listCM17 0EL: not on the flood risk listCM17 0ER: not on the flood risk listCM17 0ES: not on the flood risk listCM17 0ET: not on the flood risk listCM17 0EY: not on the flood risk listCM17 0EZ: not on the flood risk listCM17 0FA: not on the flood risk listCM17 0FB: not on the flood risk listCM17 0FE: not on the flood risk listCM17 0FF: not on the flood risk listCM17 0FG: not on the flood risk listCM17 0FJ: not on the flood risk listCM17 0FL: not on the flood risk listCM17 0FN: not on the flood risk listCM17 0FR: not on the flood risk listCM17 0FS: not on the flood risk listCM17 0FT: not on the flood risk listCM17 0FW: not on the flood risk listCM17 0FX: not on the flood risk listCM17 0FY: not on the flood risk listCM17 0GA: not on the flood risk listCM17 0GD: not on the flood risk listCM17 0GF: not on the flood risk listCM17 0GG: not on the flood risk listCM17 0GH: not on the flood risk listCM17 0GJ: not on the flood risk listCM17 0GL: not on the flood risk listCM17 0GN: not on the flood risk listCM17 0GP: not on the flood risk listCM17 0GQ: not on the flood risk listCM17 0GR: not on the flood risk listCM17 0GW: not on the flood risk listCM17 0GX: not on the flood risk listCM17 0GY: not on the flood risk listCM17 0GZ: not on the flood risk listCM17 0HA: not on the flood risk listCM17 0HB: not on the flood risk listCM17 0HD: not on the flood risk listCM17 0HE: not on the flood risk listCM17 0HF: not on the flood risk listCM17 0HG: not on the flood risk listCM17 0HH: not on the flood risk listCM17 0HJ: not on the flood risk listCM17 0HL: not on the flood risk listCM17 0HN: not on the flood risk listCM17 0HP: not on the flood risk listCM17 0HQ: not on the flood risk listCM17 0HR: not on the flood risk listCM17 0HS: not on the flood risk listCM17 0HT: not on the flood risk listCM17 0HU: not on the flood risk listCM17 0HW: not on the flood risk listCM17 0HX: not on the flood risk listCM17 0HY: not on the flood risk listCM17 0HZ: not on the flood risk listCM17 0JB: not on the flood risk listCM17 0JF: not on the flood risk listCM17 0JG: not on the flood risk listCM17 0JH: not on the flood risk listCM17 0JL: not on the flood risk listCM17 0JN: not on the flood risk listCM17 0JP: not on the flood risk listCM17 0JR: not on the flood risk listCM17 0JS: not on the flood risk listCM17 0JU: not on the flood risk listCM17 0JW: not on the flood risk listCM17 0JX: not on the flood risk listCM17 0JZ: not on the flood risk listCM17 0LA: not on the flood risk listCM17 0LB: not on the flood risk listCM17 0LD: not on the flood risk listCM17 0LE: not on the flood risk listCM17 0LG: not on the flood risk listCM17 0LH: not on the flood risk listCM17 0LJ: not on the flood risk listCM17 0LL: not on the flood risk listCM17 0LN: not on the flood risk listCM17 0LP: not on the flood risk listCM17 0LQ: not on the flood risk listCM17 0LR: not on the flood risk listCM17 0LU: not on the flood risk listCM17 0LY: not on the flood risk listCM17 0NA: not on the flood risk listCM17 0NB: not on the flood risk listCM17 0NE: not on the flood risk listCM17 0NF: not on the flood risk listCM17 0NH: not on the flood risk listCM17 0NN: not on the flood risk listCM17 0NP: not on the flood risk listCM17 0NR: not on the flood risk listCM17 0NS: not on the flood risk listCM17 0NT: not on the flood risk listCM17 0NU: not on the flood risk listCM17 0NX: not on the flood risk listCM17 0NY: not on the flood risk listCM17 0PA: not on the flood risk listCM17 0PB: not on the flood risk listCM17 0PD: not on the flood risk listCM17 0PE: not on the flood risk listCM17 0PF: not on the flood risk listCM17 0PG: not on the flood risk listCM17 0PH: not on the flood risk listCM17 0PP: not on the flood risk listCM17 0PQ: not on the flood risk listCM17 0PR: not on the flood risk listCM17 0PS: not on the flood risk listCM17 0PT: not on the flood risk listCM17 0PU: not on the flood risk listCM17 0PX: not on the flood risk listCM17 0PY: not on the flood risk listCM17 0PZ: not on the flood risk listCM17 0QA: not on the flood risk listCM17 0QB: not on the flood risk listCM17 0QD: not on the flood risk listCM17 0QE: not on the flood risk listCM17 0QF: not on the flood risk listCM17 0QL: not on the flood risk listCM17 0QN: not on the flood risk listCM17 0QP: not on the flood risk listCM17 0QR: not on the flood risk listCM17 0QS: not on the flood risk listCM17 0QT: not on the flood risk listCM17 0QU: not on the flood risk listCM17 0QW: not on the flood risk listCM17 0QX: not on the flood risk listCM17 0QY: not on the flood risk listCM17 0QZ: not on the flood risk listCM17 0RA: not on the flood risk listCM17 0RB: not on the flood risk listCM17 0RD: not on the flood risk listCM17 0RE: not on the flood risk listCM17 0RF: not on the flood risk listCM17 0RH: not on the flood risk listCM17 0RJ: not on the flood risk listCM17 0RL: not on the flood risk listCM17 0RN: not on the flood risk listCM17 0RP: not on the flood risk listCM17 0RQ: not on the flood risk listCM17 0RR: not on the flood risk listCM17 0RZ: not on the flood risk listCM17 0SA: not on the flood risk listCM17 0SB: not on the flood risk listCM17 0SD: not on the flood risk listCM17 0SF: not on the flood risk listCM17 0SG: not on the flood risk listCM17 0SH: not on the flood risk listCM17 0SJ: not on the flood risk listCM17 0SN: not on the flood risk listCM17 0SP: not on the flood risk listCM17 0SQ: not on the flood risk listCM17 0SR: not on the flood risk listCM17 0ST: not on the flood risk listCM17 0SU: not on the flood risk listCM17 0SW: not on the flood risk listCM17 0SX: not on the flood risk listCM17 0TA: not on the flood risk listCM17 0TE: not on the flood risk listCM17 9AA: not on the flood risk listCM17 9AB: not on the flood risk listCM17 9AD: not on the flood risk listCM17 9AE: not on the flood risk listCM17 9AF: not on the flood risk listCM17 9AG: not on the flood risk listCM17 9AH: not on the flood risk listCM17 9AJ: not on the flood risk listCM17 9AL: not on the flood risk listCM17 9AN: not on the flood risk listCM17 9AP: not on the flood risk listCM17 9AR: not on the flood risk listCM17 9AS: not on the flood risk listCM17 9AT: not on the flood risk listCM17 9AU: not on the flood risk listCM17 9AW: not on the flood risk listCM17 9AX: not on the flood risk listCM17 9AY: not on the flood risk listCM17 9BA: not on the flood risk listCM17 9BB: not on the flood risk listCM17 9BE: not on the flood risk listCM17 9BF: not on the flood risk listCM17 9BG: not on the flood risk listCM17 9BJ: not on the flood risk listCM17 9BL: not on the flood risk listCM17 9BN: not on the flood risk listCM17 9BT: not on the flood risk listCM17 9BU: not on the flood risk listCM17 9BW: not on the flood risk listCM17 9BX: not on the flood risk listCM17 9BY: not on the flood risk listCM17 9BZ: not on the flood risk listCM17 9DA: not on the flood risk listCM17 9DB: not on the flood risk listCM17 9DD: not on the flood risk listCM17 9DE: not on the flood risk listCM17 9DF: not on the flood risk listCM17 9DG: not on the flood risk listCM17 9DH: not on the flood risk listCM17 9DJ: not on the flood risk listCM17 9DQ: not on the flood risk listCM17 9DR: not on the flood risk listCM17 9DS: not on the flood risk listCM17 9DZ: not on the flood risk listCM17 9EA: not on the flood risk listCM17 9EG: not on the flood risk listCM17 9EH: not on the flood risk listCM17 9EJ: not on the flood risk listCM17 9EL: not on the flood risk listCM17 9EP: not on the flood risk listCM17 9ER: not on the flood risk listCM17 9ES: not on the flood risk listCM17 9ET: not on the flood risk listCM17 9EU: not on the flood risk listCM17 9EX: not on the flood risk listCM17 9EY: not on the flood risk listCM17 9EZ: not on the flood risk listCM17 9FA: not on the flood risk listCM17 9FD: not on the flood risk listCM17 9FF: not on the flood risk listCM17 9FG: not on the flood risk listCM17 9FH: not on the flood risk listCM17 9FJ: not on the flood risk listCM17 9FL: not on the flood risk listCM17 9FQ: not on the flood risk listCM17 9FR: not on the flood risk listCM17 9FS: not on the flood risk listCM17 9FT: not on the flood risk listCM17 9FU: not on the flood risk listCM17 9FW: not on the flood risk listCM17 9FY: not on the flood risk listCM17 9GD: not on the flood risk listCM17 9GE: not on the flood risk listCM17 9GF: not on the flood risk listCM17 9GG: not on the flood risk listCM17 9GH: not on the flood risk listCM17 9GJ: not on the flood risk listCM17 9GN: not on the flood risk listCM17 9GP: not on the flood risk listCM17 9GQ: not on the flood risk listCM17 9GR: not on the flood risk listCM17 9GS: not on the flood risk listCM17 9GW: not on the flood risk listCM17 9GX: not on the flood risk listCM17 9GY: not on the flood risk listCM17 9GZ: not on the flood risk listCM17 9HA: not on the flood risk listCM17 9HB: not on the flood risk listCM17 9HD: not on the flood risk listCM17 9HE: not on the flood risk listCM17 9HF: not on the flood risk listCM17 9HG: not on the flood risk listCM17 9HH: not on the flood risk listCM17 9HJ: not on the flood risk listCM17 9HL: not on the flood risk listCM17 9HN: not on the flood risk listCM17 9HP: not on the flood risk listCM17 9HQ: not on the flood risk listCM17 9HR: not on the flood risk listCM17 9HS: not on the flood risk listCM17 9HT: not on the flood risk listCM17 9HU: not on the flood risk listCM17 9HW: not on the flood risk listCM17 9HX: not on the flood risk listCM17 9HY: not on the flood risk listCM17 9HZ: not on the flood risk listCM17 9JA: not on the flood risk listCM17 9JB: not on the flood risk listCM17 9JD: not on the flood risk listCM17 9JE: not on the flood risk listCM17 9JF: not on the flood risk listCM17 9JG: not on the flood risk listCM17 9JH: not on the flood risk listCM17 9JJ: not on the flood risk listCM17 9JL: not on the flood risk listCM17 9JN: not on the flood risk listCM17 9JP: not on the flood risk listCM17 9JQ: not on the flood risk listCM17 9JT: not on the flood risk listCM17 9JU: not on the flood risk listCM17 9JW: not on the flood risk listCM17 9JX: not on the flood risk listCM17 9JY: not on the flood risk listCM17 9JZ: not on the flood risk listCM17 9LA: not on the flood risk listCM17 9LD: not on the flood risk listCM17 9LE: not on the flood risk listCM17 9LG: not on the flood risk listCM17 9LH: not on the flood risk listCM17 9LL: not on the flood risk listCM17 9LQ: not on the flood risk listCM17 9LR: not on the flood risk listCM17 9LS: not on the flood risk listCM17 9LU: not on the flood risk listCM17 9LW: not on the flood risk listCM17 9LX: not on the flood risk listCM17 9LZ: not on the flood risk listCM17 9NA: not on the flood risk listCM17 9ND: not on the flood risk listCM17 9NE: not on the flood risk listCM17 9NF: not on the flood risk listCM17 9NG: not on the flood risk listCM17 9NJ: not on the flood risk listCM17 9NL: not on the flood risk listCM17 9NN: not on the flood risk listCM17 9NQ: not on the flood risk listCM17 9NR: not on the flood risk listCM17 9NS: not on the flood risk listCM17 9NT: not on the flood risk listCM17 9NY: not on the flood risk listCM17 9PA: not on the flood risk listCM17 9PB: not on the flood risk listCM17 9PD: not on the flood risk listCM17 9PE: not on the flood risk listCM17 9PF: not on the flood risk listCM17 9PG: not on the flood risk listCM17 9PH: not on the flood risk listCM17 9PJ: not on the flood risk listCM17 9PL: not on the flood risk listCM17 9PN: not on the flood risk listCM17 9PP: not on the flood risk listCM17 9PQ: not on the flood risk listCM17 9PR: not on the flood risk listCM17 9PS: not on the flood risk listCM17 9PT: not on the flood risk listCM17 9PU: not on the flood risk listCM17 9PW: not on the flood risk listCM17 9PX: not on the flood risk listCM17 9PY: not on the flood risk listCM17 9PZ: not on the flood risk listCM17 9QA: not on the flood risk listCM17 9QB: not on the flood risk listCM17 9QE: not on the flood risk listCM17 9QF: not on the flood risk listCM17 9QH: not on the flood risk listCM17 9QJ: not on the flood risk listCM17 9QL: not on the flood risk listCM17 9QN: not on the flood risk listCM17 9QP: not on the flood risk listCM17 9QQ: not on the flood risk listCM17 9QR: not on the flood risk listCM17 9QS: not on the flood risk listCM17 9QT: not on the flood risk listCM17 9QU: not on the flood risk listCM17 9QW: not on the flood risk listCM17 9QX: not on the flood risk listCM17 9QY: not on the flood risk listCM17 9RA: not on the flood risk listCM17 9RB: not on the flood risk listCM17 9RG: not on the flood risk listCM17 9RH: not on the flood risk listCM17 9RL: not on the flood risk listCM17 9RR: not on the flood risk listCM17 9RT: not on the flood risk listCM17 9RU: not on the flood risk listCM17 9RX: not on the flood risk listCM17 9RY: not on the flood risk listCM17 9RZ: not on the flood risk listCM17 9SA: not on the flood risk listCM17 9SB: not on the flood risk listCM17 9SD: not on the flood risk listCM17 9SE: not on the flood risk listCM17 9SF: not on the flood risk listCM17 9SG: not on the flood risk listCM17 9SH: not on the flood risk listCM17 9SJ: not on the flood risk listCM17 9SN: not on the flood risk listCM17 9SR: not on the flood risk listCM17 9SS: not on the flood risk listCM17 9ST: not on the flood risk listCM17 9SW: not on the flood risk listCM17 9SX: not on the flood risk listCM17 9SY: not on the flood risk listCM17 9TA: not on the flood risk listCM17 9TB: not on the flood risk listCM17 9TD: not on the flood risk listCM17 9TE: not on the flood risk listCM17 9TF: not on the flood risk listCM17 9TG: not on the flood risk listCM17 9TH: not on the flood risk listCM17 9TJ: not on the flood risk listCM17 9TL: not on the flood risk listCM17 9TN: not on the flood risk listCM17 9TP: not on the flood risk listCM17 9TQ: not on the flood risk listCM17 9TR: not on the flood risk listCM17 9TS: not on the flood risk listCM17 9TT: not on the flood risk listCM17 9TW: not on the flood risk listCM17 9TX: not on the flood risk listCM17 9TZ: not on the flood risk listCM17 9UB: not on the flood risk listCM17 9UD: not on the flood risk listCM17 9UF: not on the flood risk listCM17 9UG: not on the flood risk listCM17 9UH: not on the flood risk listCM17 9UJ: not on the flood risk listCM17 9UN: not on the flood risk listCM17 9UQ: not on the flood risk listCM17 9UR: not on the flood risk listCM17 9UU: not on the flood risk listCM17 9UW: not on the flood risk listCM17 9WG: not on the flood risk listCM17 9WH: not on the flood risk listCM17 9XA: not on the flood risk listCM17 9XB: not on the flood risk listCM17 9XD: not on the flood risk listCM17 9XE: not on the flood risk listCM17 9XH: not on the flood risk listCM17 0NG: low flood risk at worstCM17 0NJ: low flood risk at worstCM17 0JJ: high flood riskCM17 0JD: high flood riskCM17 0JT: high flood riskCM17 0NL: high flood risk Old HarlowChurch Langley North & Newhall Map of every postcode in CM17, by flood risk Of the 529 postcodes in CM17 that ONS places, 4 have a home or business at high risk, 2 are at low risk at worst and 523 are not on the Environment Agency's at-risk list. Places named: Old Harlow, Church Langley North & Newhall. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2 km. Old HarlowChurch Langley North & Newhall
  • A home or business at high risk: 4
  • At medium risk at worst: 0
  • At low risk at worst: 2
  • At very low risk only: 0
  • Not on the at-risk list: 523

Of the 529 postcodes in CM17 that ONS places, 4 have a home or business at high risk, 2 are at low risk at worst and 523 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. No boundary is drawn. Where marks overlap, the one first in the key is drawn; the counts include every postcode. Names in italics are council wards: we hold no town or village names here.

The middle of its postcodes: latitude 51.7735, longitude 0.1462. 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.

CM17 0NL3 at high riskCM17 0JD1 at high riskCM17 0JJ1 at high riskCM17 0JT1 at high risk

What broadband can you get in CM17?

Ofcom reports on 523 of the 529 postcodes in CM17. At 339 of them every home and business can get gigabit broadband, and at 3 some cannot get decent broadband (10 Mbit/s).

Postcodes where every home can get gigabit339 of 523
Postcodes where every home can get superfast479 of 523
Postcodes where some cannot get decent broadband3 of 523

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 CM17 at risk of flooding?

6 of the 529 postcodes in CM17 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 6 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 6 of 529 postcodes High: 6Low: 3

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 CM17?

Homes in CM17 sold for a typical £396,000 in the 12 months to August 2026, across 345 sales, up 0.3% on the 12 months before, HM Land Registry's figures show.

£396,000 typical price, the 12 months to August 2026
12 months to August 2025
£395,000
12 months to August 2026
£396,000

▲ up 0.3% on the 12 months before

Detached£546,250 92 sales
Semi-detached£440,000 73 sales
Terraced£355,000 113 sales
Flat or maisonette£235,000 67 sales

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 CM17

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

CM17 0241 postcodesCM17 9288 postcodes
UK postcode format explained

Places in CM17

Towns and villages with postcodes in CM17, and how many each has here.

Harlow postcodes,435

Who covers CM17

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

  • Harlow522
  • Brentwood and Ongar7

Police force areas

  • Essex529

Next to CM17

CM16 postcode district CM18 postcode district All CM districts Harlow postcodes

"Next to" is by number: the districts before and after CM17 in the CM area.

Check a postcode

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