SA99 1 postcode sector in the SA99 district

SA99 1 is a sector of the SA99 district: every postcode that starts SA99 1. It has 65 postcodes in use, 65 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 SA99 1 sector, and which are new since 2020

Map of every postcode in the SA99 1 sector, by new since 2020 Of the 65 postcodes in the SA99 1 sector that ONS places, 65 were in use before 2020. Places named: Mynydd-bach. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. A48 SA99 1AA: before 2020 Mynydd-bach Map of every postcode in the SA99 1 sector, by new since 2020 Of the 65 postcodes in the SA99 1 sector that ONS places, 65 were in use before 2020. Places named: Mynydd-bach. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. A48 Mynydd-bach
  • New since 2020: 0
  • In use before 2020: 65

Of the 65 postcodes in the SA99 1 sector that ONS places, 65 were in use before 2020.

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. New since 2020 means it came into use in January 2020 or later. 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; when each came into use: the same directory; 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

Postcodes in SA99 1

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.

SA99 1AASA99 1ABSA99 1ADSA99 1AESA99 1AFSA99 1AGSA99 1AHSA99 1AJSA99 1ALSA99 1ANSA99 1APSA99 1AQSA99 1ARSA99 1ATSA99 1AUSA99 1AWSA99 1AXSA99 1AYSA99 1AZSA99 1BASA99 1BBSA99 1BDSA99 1BESA99 1BFSA99 1BGSA99 1BJSA99 1BLSA99 1BNSA99 1BPSA99 1BRSA99 1BSSA99 1BTSA99 1BUSA99 1BWSA99 1BXSA99 1BYSA99 1BZSA99 1DASA99 1DBSA99 1DDSA99 1DFSA99 1DGSA99 1DHSA99 1DJSA99 1DLSA99 1DNSA99 1DPSA99 1DQSA99 1DRSA99 1DSSA99 1DTSA99 1DUSA99 1DWSA99 1DXSA99 1DYSA99 1DZSA99 1STSA99 1TUSA99 1YWSA99 1YXSA99 1ZASA99 1ZBSA99 1ZWSA99 1ZXSA99 1ZZ

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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