DN31 3 postcode sector in the DN31 district

DN31 3 is a sector of the DN31 district: every postcode that starts DN31 3. It has 71 postcodes in use, 10 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 DN31 3 sector, by flood risk

Map of every postcode in the DN31 3 sector, by flood risk Of the 71 postcodes in the DN31 3 sector that ONS places, 8 have a home or business at high risk, 21 are at medium risk at worst, 36 are at low risk at worst, 2 are at very low risk only and 4 are not on the Environment Agency's at-risk list. 2 groups of postcodes at high or medium risk are outlined: 14 postcodes at high or medium risk; 5 postcodes at high or medium risk. One postcode lies beyond the edge and is listed under the map. Places named: East Marsh, West Marsh. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. A16 DN31 3UA: not on the flood risk listDN31 3AH: very low flood risk onlyDN31 3SH: very low flood risk onlyDN31 3AA: low flood risk at worstDN31 3AE: low flood risk at worstDN31 3AG: low flood risk at worstDN31 3AL: low flood risk at worstDN31 3AN: low flood risk at worstDN31 3AR: low flood risk at worstDN31 3AT: low flood risk at worstDN31 3AU: low flood risk at worstDN31 3BL: low flood risk at worstDN31 3BP: low flood risk at worstDN31 3BU: low flood risk at worstDN31 3BY: low flood risk at worstDN31 3DA: low flood risk at worstDN31 3DH: low flood risk at worstDN31 3DS: low flood risk at worstDN31 3DT: low flood risk at worstDN31 3DU: low flood risk at worstDN31 3DX: low flood risk at worstDN31 3EF: low flood risk at worstDN31 3FS: low flood risk at worstDN31 3HL: low flood risk at worstDN31 3HY: low flood risk at worstDN31 3JD: low flood risk at worstDN31 3JH: low flood risk at worstDN31 3JP: low flood risk at worstDN31 3JS: low flood risk at worstDN31 3LA: low flood risk at worstDN31 3LB: low flood risk at worstDN31 3LL: low flood risk at worstDN31 3LQ: low flood risk at worstDN31 3LS: low flood risk at worstDN31 3LW: low flood risk at worstDN31 3NB: low flood risk at worstDN31 3RD: low flood risk at worstDN31 3SG: low flood risk at worstDN31 3TN: low flood risk at worstDN31 3AF: medium flood risk at worstDN31 3AX: medium flood risk at worstDN31 3AY: medium flood risk at worstDN31 3BE: medium flood risk at worstDN31 3BH: medium flood risk at worstDN31 3BT: medium flood risk at worstDN31 3ER: medium flood risk at worstDN31 3ET: medium flood risk at worstDN31 3EW: medium flood risk at worstDN31 3HB: medium flood risk at worstDN31 3HF: medium flood risk at worstDN31 3HG: medium flood risk at worstDN31 3HH: medium flood risk at worstDN31 3HW: medium flood risk at worstDN31 3LG: medium flood risk at worstDN31 3NE: medium flood risk at worstDN31 3PD: medium flood risk at worstDN31 3PU: medium flood risk at worstDN31 3QF: medium flood risk at worstDN31 3SD: medium flood risk at worstDN31 3SW: medium flood risk at worstDN31 3PG: high flood riskDN31 3QJ: high flood riskDN31 3QL: high flood riskDN31 3RP: high flood riskDN31 3SL: high flood riskDN31 3SX: high flood riskDN31 3SY: high flood riskDN31 3TD: high flood risk East MarshWest Marsh 14 postcodes at high or medium risk, outlined: this goes to DN31 3HW, the one with most homes and businesses at high risk14 postcodes at high or medium risk5 postcodes at high or medium risk, outlined: this goes to DN31 3RP, the one with most homes and businesses at high risk5 postcodes at high or medium risk Map of every postcode in the DN31 3 sector, by flood risk Of the 71 postcodes in the DN31 3 sector that ONS places, 8 have a home or business at high risk, 21 are at medium risk at worst, 36 are at low risk at worst, 2 are at very low risk only and 4 are not on the Environment Agency's at-risk list. 2 groups of postcodes at high or medium risk are outlined: 14 postcodes at high or medium risk; 5 postcodes at high or medium risk. One postcode lies beyond the edge and is listed under the map. Places named: East Marsh, West Marsh. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. East MarshWest Marsh
  • A home or business at high risk: 8
  • At medium risk at worst: 21
  • At low risk at worst: 36
  • At very low risk only: 2
  • Not on the at-risk list: 4
  • Outline: where 5 or more postcodes at high or medium risk lie together

Of the 71 postcodes in the DN31 3 sector that ONS places, 8 have a home or business at high risk, 21 are at medium risk at worst, 36 are at low risk at worst, 2 are at very low risk only and 4 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 160 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. 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.

DN31 3SX26 at high riskDN31 3SY20 at high riskDN31 3QJ9 at high riskDN31 3TD7 at high riskDN31 3PG2 at high riskDN31 3RP1 at high riskDN31 3QL1 at high riskDN31 3SL1 at high risk

Further out, not drawn

This postcode lies well apart from the rest, so the map is drawn without it to show the rest closer; it is in every count.

DN31 3AS

Where the postcodes at high or medium risk lie together

  • 14 postcodes at high or medium risk, outlined on the map. DN31 3HW, is the one with most homes and businesses at high risk.
  • 5 postcodes at high or medium risk, outlined on the map. DN31 3RP, is the one with most homes and businesses at high risk.

Postcodes in DN31 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.

DN31 3AADN31 3AEDN31 3AFDN31 3AGDN31 3AHDN31 3ALDN31 3ANDN31 3ARDN31 3ASDN31 3ATDN31 3AUDN31 3AXDN31 3AYDN31 3BEDN31 3BHDN31 3BLDN31 3BPDN31 3BTDN31 3BUDN31 3BYDN31 3DADN31 3DHDN31 3DSDN31 3DTDN31 3DUDN31 3DXDN31 3EFDN31 3ERDN31 3ETDN31 3EWDN31 3FSDN31 3HBDN31 3HFDN31 3HGDN31 3HHDN31 3HLDN31 3HWDN31 3HYDN31 3JDDN31 3JHDN31 3JPDN31 3JSDN31 3LADN31 3LBDN31 3LGDN31 3LLDN31 3LQDN31 3LSDN31 3LWDN31 3NBDN31 3NEDN31 3PDDN31 3PGDN31 3PUDN31 3QFDN31 3QJDN31 3QLDN31 3RDDN31 3RPDN31 3SDDN31 3SGDN31 3SHDN31 3SLDN31 3SWDN31 3SXDN31 3SYDN31 3TDDN31 3TJDN31 3TNDN31 3UADN31 3WT

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.

Check a postcode

Something wrong on this page? Report an error and we will check it against the source.