N18 3 postcode sector in the N18 district

N18 3 is a sector of the N18 district: every postcode that starts N18 3. It has 35 postcodes in use, 3 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 N18 3 sector, by flood risk

Map of every postcode in the N18 3 sector, by flood risk Of the 35 postcodes in the N18 3 sector that ONS places, 5 have a home or business at high risk, 10 are at medium risk at worst, 13 are at low risk at worst, 2 are at very low risk only and 5 are not on the Environment Agency's at-risk list. 2 groups of postcodes at high or medium risk are outlined: 8 postcodes at high or medium risk; 6 postcodes at high or medium risk. Places named: Edmonton Green, Upper Edmonton. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. A1055A406 N18 3AB: not on the flood risk listN18 3BJ: not on the flood risk listN18 3HQ: not on the flood risk listN18 3PE: not on the flood risk listN18 3QU: not on the flood risk listN18 3BA: very low flood risk onlyN18 3HF: very low flood risk onlyN18 3AF: low flood risk at worstN18 3AG: low flood risk at worstN18 3AH: low flood risk at worstN18 3AJ: low flood risk at worstN18 3AL: low flood risk at worstN18 3AT: low flood risk at worstN18 3BF: low flood risk at worstN18 3DJ: low flood risk at worstN18 3HA: low flood risk at worstN18 3PD: low flood risk at worstN18 3PH: low flood risk at worstN18 3PL: low flood risk at worstN18 3PP: low flood risk at worstN18 3BB: medium flood risk at worstN18 3BD: medium flood risk at worstN18 3BH: medium flood risk at worstN18 3BY: medium flood risk at worstN18 3HT: medium flood risk at worstN18 3HU: medium flood risk at worstN18 3PA: medium flood risk at worstN18 3PN: medium flood risk at worstN18 3PS: medium flood risk at worstN18 3PU: medium flood risk at worstN18 3DW: high flood riskN18 3PR: high flood riskN18 3QT: high flood riskN18 3QW: high flood riskN18 3QX: high flood risk Edmonton GreenUpper Edmonton 8 postcodes at high or medium risk, outlined: this goes to N18 3PR, the one with most homes and businesses at high risk8 postcodes at high or medium risk6 postcodes at high or medium risk, outlined: this goes to N18 3QT, the one with most homes and businesses at high risk6 postcodes at high or medium risk Map of every postcode in the N18 3 sector, by flood risk Of the 35 postcodes in the N18 3 sector that ONS places, 5 have a home or business at high risk, 10 are at medium risk at worst, 13 are at low risk at worst, 2 are at very low risk only and 5 are not on the Environment Agency's at-risk list. 2 groups of postcodes at high or medium risk are outlined: 8 postcodes at high or medium risk; 6 postcodes at high or medium risk. Places named: Edmonton Green, Upper Edmonton. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. A406 Edmonton GreenUpper Edmonton
  • A home or business at high risk: 5
  • At medium risk at worst: 10
  • At low risk at worst: 13
  • At very low risk only: 2
  • Not on the at-risk list: 5
  • Outline: where 5 or more postcodes at high or medium risk lie together

Of the 35 postcodes in the N18 3 sector that ONS places, 5 have a home or business at high risk, 10 are at medium risk at worst, 13 are at low risk at worst, 2 are at very low risk only and 5 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 210 metres of each other. It is not a boundary, and no boundary is drawn. Names in italics are council wards: we hold no town or village names here.

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.

N18 3QT13 at high riskN18 3PR9 at high riskN18 3QW7 at high riskN18 3QX6 at high riskN18 3DW1 at high risk

Where the postcodes at high or medium risk lie together

  • 8 postcodes at high or medium risk, outlined on the map. N18 3PR, is the one with most homes and businesses at high risk.
  • 6 postcodes at high or medium risk, outlined on the map. N18 3QT, is the one with most homes and businesses at high risk.

Postcodes in N18 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.

N18 3ABN18 3AFN18 3AGN18 3AHN18 3AJN18 3ALN18 3ATN18 3BAN18 3BBN18 3BDN18 3BFN18 3BHN18 3BJN18 3BYN18 3DJN18 3DWN18 3HAN18 3HFN18 3HQN18 3HTN18 3HUN18 3PAN18 3PDN18 3PEN18 3PHN18 3PLN18 3PNN18 3PPN18 3PRN18 3PSN18 3PUN18 3QTN18 3QUN18 3QWN18 3QX

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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