SN1 3 postcode sector in the SN1 district

SN1 3 is a sector of the SN1 district: every postcode that starts SN1 3. It has 158 postcodes in use, 4 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 SN1 3 sector, by flood risk

Map of every postcode in the SN1 3 sector, by flood risk Of the 158 postcodes in the SN1 3 sector that ONS places, 158 are not on the Environment Agency's at-risk list. One postcode lies beyond the edge and is listed under the map. Places named: Queen's Park, Old Town & Lawn. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. A4289 SN1 3AD: not on the flood risk listSN1 3AE: not on the flood risk listSN1 3AF: not on the flood risk listSN1 3AG: not on the flood risk listSN1 3AH: not on the flood risk listSN1 3AJ: not on the flood risk listSN1 3AL: not on the flood risk listSN1 3AQ: not on the flood risk listSN1 3AS: not on the flood risk listSN1 3AU: not on the flood risk listSN1 3AW: not on the flood risk listSN1 3AY: not on the flood risk listSN1 3BB: not on the flood risk listSN1 3BD: not on the flood risk listSN1 3BF: not on the flood risk listSN1 3BH: not on the flood risk listSN1 3BP: not on the flood risk listSN1 3BU: not on the flood risk listSN1 3DB: not on the flood risk listSN1 3DD: not on the flood risk listSN1 3DE: not on the flood risk listSN1 3DF: not on the flood risk listSN1 3DP: not on the flood risk listSN1 3DQ: not on the flood risk listSN1 3DR: not on the flood risk listSN1 3DT: not on the flood risk listSN1 3DU: not on the flood risk listSN1 3DX: not on the flood risk listSN1 3EB: not on the flood risk listSN1 3ED: not on the flood risk listSN1 3EE: not on the flood risk listSN1 3EF: not on the flood risk listSN1 3EG: not on the flood risk listSN1 3EP: not on the flood risk listSN1 3ET: not on the flood risk listSN1 3EX: not on the flood risk listSN1 3EY: not on the flood risk listSN1 3FA: not on the flood risk listSN1 3FB: not on the flood risk listSN1 3FD: not on the flood risk listSN1 3FE: not on the flood risk listSN1 3FF: not on the flood risk listSN1 3FG: not on the flood risk listSN1 3FH: not on the flood risk listSN1 3FJ: not on the flood risk listSN1 3FL: not on the flood risk listSN1 3FN: not on the flood risk listSN1 3FP: not on the flood risk listSN1 3FQ: not on the flood risk listSN1 3FR: not on the flood risk listSN1 3FS: not on the flood risk listSN1 3FT: not on the flood risk listSN1 3HA: not on the flood risk listSN1 3HB: not on the flood risk listSN1 3HE: not on the flood risk listSN1 3HF: not on the flood risk listSN1 3HG: not on the flood risk listSN1 3HH: not on the flood risk listSN1 3HJ: not on the flood risk listSN1 3HL: not on the flood risk listSN1 3HN: not on the flood risk listSN1 3HP: not on the flood risk listSN1 3HQ: not on the flood risk listSN1 3HR: not on the flood risk listSN1 3HS: not on the flood risk listSN1 3HT: not on the flood risk listSN1 3HU: not on the flood risk listSN1 3HW: not on the flood risk listSN1 3HX: not on the flood risk listSN1 3HY: not on the flood risk listSN1 3HZ: not on the flood risk listSN1 3JA: not on the flood risk listSN1 3JB: not on the flood risk listSN1 3JD: not on the flood risk listSN1 3JE: not on the flood risk listSN1 3JF: not on the flood risk listSN1 3JG: not on the flood risk listSN1 3JH: not on the flood risk listSN1 3JJ: not on the flood risk listSN1 3JL: not on the flood risk listSN1 3JN: not on the flood risk listSN1 3JP: not on the flood risk listSN1 3JR: not on the flood risk listSN1 3JS: not on the flood risk listSN1 3JT: not on the flood risk listSN1 3JU: not on the flood risk listSN1 3JW: not on the flood risk listSN1 3JX: not on the flood risk listSN1 3JY: not on the flood risk listSN1 3LA: not on the flood risk listSN1 3LB: not on the flood risk listSN1 3LD: not on the flood risk listSN1 3LE: not on the flood risk listSN1 3LF: not on the flood risk listSN1 3LG: not on the flood risk listSN1 3LH: not on the flood risk listSN1 3LJ: not on the flood risk listSN1 3LL: not on the flood risk listSN1 3LQ: not on the flood risk listSN1 3LR: not on the flood risk listSN1 3LS: not on the flood risk listSN1 3LT: not on the flood risk listSN1 3LU: not on the flood risk listSN1 3LW: not on the flood risk listSN1 3LX: not on the flood risk listSN1 3LY: not on the flood risk listSN1 3LZ: not on the flood risk listSN1 3NA: not on the flood risk listSN1 3NB: not on the flood risk listSN1 3ND: not on the flood risk listSN1 3NE: not on the flood risk listSN1 3NF: not on the flood risk listSN1 3NG: not on the flood risk listSN1 3NH: not on the flood risk listSN1 3NJ: not on the flood risk listSN1 3NL: not on the flood risk listSN1 3NN: not on the flood risk listSN1 3NP: not on the flood risk listSN1 3NQ: not on the flood risk listSN1 3NR: not on the flood risk listSN1 3NS: not on the flood risk listSN1 3NT: not on the flood risk listSN1 3NU: not on the flood risk listSN1 3NW: not on the flood risk listSN1 3NX: not on the flood risk listSN1 3NY: not on the flood risk listSN1 3NZ: not on the flood risk listSN1 3PA: not on the flood risk listSN1 3PB: not on the flood risk listSN1 3PD: not on the flood risk listSN1 3PE: not on the flood risk listSN1 3PF: not on the flood risk listSN1 3PG: not on the flood risk listSN1 3PH: not on the flood risk listSN1 3PJ: not on the flood risk listSN1 3PL: not on the flood risk listSN1 3PN: not on the flood risk listSN1 3PP: not on the flood risk listSN1 3PQ: not on the flood risk listSN1 3PR: not on the flood risk listSN1 3PS: not on the flood risk listSN1 3PT: not on the flood risk listSN1 3PU: not on the flood risk listSN1 3PW: not on the flood risk listSN1 3PX: not on the flood risk listSN1 3PY: not on the flood risk listSN1 3PZ: not on the flood risk listSN1 3QA: not on the flood risk listSN1 3QB: not on the flood risk listSN1 3QD: not on the flood risk listSN1 3QF: not on the flood risk listSN1 3RA: not on the flood risk listSN1 3RT: not on the flood risk listSN1 3RW: not on the flood risk listSN1 3UZ: not on the flood risk list Queen's ParkOld Town & Lawn Map of every postcode in the SN1 3 sector, by flood risk Of the 158 postcodes in the SN1 3 sector that ONS places, 158 are not on the Environment Agency's at-risk list. One postcode lies beyond the edge and is listed under the map. Places named: Queen's Park, Old Town & Lawn. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. Queen's ParkOld Town & Lawn
  • A home or business at high risk: 0
  • At medium risk at worst: 0
  • At low risk at worst: 0
  • At very low risk only: 0
  • Not on the at-risk list: 158

Of the 158 postcodes in the SN1 3 sector that ONS places, 158 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.

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

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.

SN1 3XL

What do homes sell for in SN1 3?

Homes in SN1 3 sold for a typical £225,000 in the 12 months to August 2026, across 99 sales, up 4.7% on the 12 months before, HM Land Registry's figures show.

£225,000 typical price, the 12 months to August 2026
£215,000 12 months to August 2025
▲ up 4.7% on the 12 months before
  • Detached 2 sales, too few to price
  • Semi-detached £350,000 5 sales
  • Terraced £236,000 64 sales
  • Flat or maisonette £121,000 28 sales

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

Standard sales of homes at market value at the postcodes that start SN1 3. A typical price is the median, the middle sale, given from 5 sales or more.

How we work this out: house prices by postcode

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 SN1 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.

SN1 3ADSN1 3AESN1 3AFSN1 3AGSN1 3AHSN1 3AJSN1 3ALSN1 3AQSN1 3ASSN1 3AUSN1 3AWSN1 3AYSN1 3BBSN1 3BDSN1 3BFSN1 3BGSN1 3BHSN1 3BLSN1 3BPSN1 3BUSN1 3DBSN1 3DDSN1 3DESN1 3DFSN1 3DPSN1 3DQSN1 3DRSN1 3DTSN1 3DUSN1 3DXSN1 3EBSN1 3EDSN1 3EESN1 3EFSN1 3EGSN1 3EPSN1 3ETSN1 3EXSN1 3EYSN1 3FASN1 3FBSN1 3FDSN1 3FESN1 3FFSN1 3FGSN1 3FHSN1 3FJSN1 3FLSN1 3FNSN1 3FPSN1 3FQSN1 3FRSN1 3FSSN1 3FTSN1 3HASN1 3HBSN1 3HESN1 3HFSN1 3HGSN1 3HHSN1 3HJSN1 3HLSN1 3HNSN1 3HPSN1 3HQSN1 3HRSN1 3HSSN1 3HTSN1 3HUSN1 3HWSN1 3HXSN1 3HYSN1 3HZSN1 3JASN1 3JBSN1 3JDSN1 3JESN1 3JFSN1 3JGSN1 3JHSN1 3JJSN1 3JLSN1 3JNSN1 3JPSN1 3JRSN1 3JSSN1 3JTSN1 3JUSN1 3JWSN1 3JXSN1 3JYSN1 3LASN1 3LBSN1 3LDSN1 3LESN1 3LFSN1 3LGSN1 3LHSN1 3LJSN1 3LLSN1 3LQSN1 3LRSN1 3LSSN1 3LTSN1 3LUSN1 3LWSN1 3LXSN1 3LYSN1 3LZSN1 3NASN1 3NBSN1 3NDSN1 3NESN1 3NFSN1 3NGSN1 3NHSN1 3NJSN1 3NLSN1 3NNSN1 3NPSN1 3NQSN1 3NRSN1 3NSSN1 3NTSN1 3NUSN1 3NWSN1 3NXSN1 3NYSN1 3NZSN1 3PASN1 3PBSN1 3PDSN1 3PESN1 3PFSN1 3PGSN1 3PHSN1 3PJSN1 3PLSN1 3PNSN1 3PPSN1 3PQSN1 3PRSN1 3PSSN1 3PTSN1 3PUSN1 3PWSN1 3PXSN1 3PYSN1 3PZSN1 3QASN1 3QBSN1 3QDSN1 3QFSN1 3RASN1 3RTSN1 3RWSN1 3UZSN1 3XL

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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