B21 0 postcode sector in the B21 district

B21 0 is a sector of the B21 district: every postcode that starts B21 0. It has 166 postcodes in use, 2 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 B21 0 sector, by flood risk

Map of every postcode in the B21 0 sector, by flood risk Of the 166 postcodes in the B21 0 sector that ONS places, 5 have a home or business at high risk, 4 are at medium risk at worst, 4 are at low risk at worst and 153 are not on the Environment Agency's at-risk list. Places named: Soho & Jewellery Quarter, Holyhead. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. B21 0AB: not on the flood risk listB21 0AF: not on the flood risk listB21 0AL: not on the flood risk listB21 0AP: not on the flood risk listB21 0AQ: not on the flood risk listB21 0AR: not on the flood risk listB21 0AS: not on the flood risk listB21 0AT: not on the flood risk listB21 0AU: not on the flood risk listB21 0AW: not on the flood risk listB21 0AX: not on the flood risk listB21 0AY: not on the flood risk listB21 0BA: not on the flood risk listB21 0BB: not on the flood risk listB21 0BD: not on the flood risk listB21 0BE: not on the flood risk listB21 0BH: not on the flood risk listB21 0BJ: not on the flood risk listB21 0BN: not on the flood risk listB21 0BQ: not on the flood risk listB21 0BS: not on the flood risk listB21 0DA: not on the flood risk listB21 0DB: not on the flood risk listB21 0DD: not on the flood risk listB21 0DE: not on the flood risk listB21 0DG: not on the flood risk listB21 0DH: not on the flood risk listB21 0DJ: not on the flood risk listB21 0DL: not on the flood risk listB21 0DN: not on the flood risk listB21 0DP: not on the flood risk listB21 0DR: not on the flood risk listB21 0DS: not on the flood risk listB21 0EA: not on the flood risk listB21 0EB: not on the flood risk listB21 0ED: not on the flood risk listB21 0EE: not on the flood risk listB21 0EF: not on the flood risk listB21 0EG: not on the flood risk listB21 0EH: not on the flood risk listB21 0EJ: not on the flood risk listB21 0EL: not on the flood risk listB21 0EN: not on the flood risk listB21 0EP: not on the flood risk listB21 0ER: not on the flood risk listB21 0ES: not on the flood risk listB21 0ET: not on the flood risk listB21 0EU: not on the flood risk listB21 0EW: not on the flood risk listB21 0EX: not on the flood risk listB21 0EY: not on the flood risk listB21 0EZ: not on the flood risk listB21 0HA: not on the flood risk listB21 0HB: not on the flood risk listB21 0HD: not on the flood risk listB21 0HE: not on the flood risk listB21 0HH: not on the flood risk listB21 0HJ: not on the flood risk listB21 0HL: not on the flood risk listB21 0HN: not on the flood risk listB21 0HP: not on the flood risk listB21 0HQ: not on the flood risk listB21 0HR: not on the flood risk listB21 0HS: not on the flood risk listB21 0HT: not on the flood risk listB21 0HU: not on the flood risk listB21 0HX: not on the flood risk listB21 0HY: not on the flood risk listB21 0HZ: not on the flood risk listB21 0JD: not on the flood risk listB21 0JJ: not on the flood risk listB21 0JL: not on the flood risk listB21 0JP: not on the flood risk listB21 0JS: not on the flood risk listB21 0LA: not on the flood risk listB21 0LE: not on the flood risk listB21 0LG: not on the flood risk listB21 0LH: not on the flood risk listB21 0LL: not on the flood risk listB21 0LS: not on the flood risk listB21 0LT: not on the flood risk listB21 0NA: not on the flood risk listB21 0NG: not on the flood risk listB21 0NH: not on the flood risk listB21 0NL: not on the flood risk listB21 0NP: not on the flood risk listB21 0NQ: not on the flood risk listB21 0NU: not on the flood risk listB21 0PA: not on the flood risk listB21 0PD: not on the flood risk listB21 0PF: not on the flood risk listB21 0PG: not on the flood risk listB21 0PH: not on the flood risk listB21 0PJ: not on the flood risk listB21 0PL: not on the flood risk listB21 0PN: not on the flood risk listB21 0PP: not on the flood risk listB21 0PU: not on the flood risk listB21 0PX: not on the flood risk listB21 0QD: not on the flood risk listB21 0QE: not on the flood risk listB21 0QG: not on the flood risk listB21 0QH: not on the flood risk listB21 0QJ: not on the flood risk listB21 0QL: not on the flood risk listB21 0QU: not on the flood risk listB21 0QW: not on the flood risk listB21 0QY: not on the flood risk listB21 0RA: not on the flood risk listB21 0RB: not on the flood risk listB21 0RD: not on the flood risk listB21 0RG: not on the flood risk listB21 0RH: not on the flood risk listB21 0RJ: not on the flood risk listB21 0RL: not on the flood risk listB21 0RN: not on the flood risk listB21 0RS: not on the flood risk listB21 0RW: not on the flood risk listB21 0RY: not on the flood risk listB21 0SA: not on the flood risk listB21 0SB: not on the flood risk listB21 0SD: not on the flood risk listB21 0SE: not on the flood risk listB21 0SF: not on the flood risk listB21 0SG: not on the flood risk listB21 0SH: not on the flood risk listB21 0SJ: not on the flood risk listB21 0SL: not on the flood risk listB21 0SN: not on the flood risk listB21 0SQ: not on the flood risk listB21 0SU: not on the flood risk listB21 0SZ: not on the flood risk listB21 0TA: not on the flood risk listB21 0TG: not on the flood risk listB21 0TJ: not on the flood risk listB21 0TL: not on the flood risk listB21 0TN: not on the flood risk listB21 0TP: not on the flood risk listB21 0TQ: not on the flood risk listB21 0TR: not on the flood risk listB21 0TS: not on the flood risk listB21 0TT: not on the flood risk listB21 0TU: not on the flood risk listB21 0TW: not on the flood risk listB21 0UB: not on the flood risk listB21 0UD: not on the flood risk listB21 0UE: not on the flood risk listB21 0UH: not on the flood risk listB21 0UJ: not on the flood risk listB21 0UL: not on the flood risk listB21 0UN: not on the flood risk listB21 0UX: not on the flood risk listB21 0UY: not on the flood risk listB21 0SY: low flood risk at worstB21 0TE: low flood risk at worstB21 0UP: low flood risk at worstB21 0UQ: low flood risk at worstB21 0SX: medium flood risk at worstB21 0UR: medium flood risk at worstB21 0US: medium flood risk at worstB21 0UU: medium flood risk at worstB21 0RE: high flood riskB21 0TB: high flood riskB21 0TD: high flood riskB21 0TH: high flood riskB21 0UT: high flood risk Soho & Jewellery QuarterHolyhead Map of every postcode in the B21 0 sector, by flood risk Of the 166 postcodes in the B21 0 sector that ONS places, 5 have a home or business at high risk, 4 are at medium risk at worst, 4 are at low risk at worst and 153 are not on the Environment Agency's at-risk list. Places named: Soho & Jewellery Quarter, Holyhead. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. Soho & Jewellery QuarterHolyhead
  • A home or business at high risk: 5
  • At medium risk at worst: 4
  • At low risk at worst: 4
  • At very low risk only: 0
  • Not on the at-risk list: 153

Of the 166 postcodes in the B21 0 sector that ONS places, 5 have a home or business at high risk, 4 are at medium risk at worst, 4 are at low risk at worst and 153 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. 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.

B21 0TD22 at high riskB21 0RE3 at high riskB21 0TH3 at high riskB21 0UT2 at high riskB21 0TB2 at high risk

What do homes sell for in B21 0?

Homes in B21 0 sold for a typical £180,000 in the 12 months to August 2026, across 27 sales, up 12.5% on the 12 months before, HM Land Registry's figures show.

£180,000 typical price, the 12 months to August 2026
£160,000 12 months to August 2025
▲ up 12.5% on the 12 months before
  • Semi-detached £220,000 5 sales
  • Terraced £172,500 22 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 B21 0. 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 B21 0

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.

B21 0ABB21 0AFB21 0ALB21 0APB21 0AQB21 0ARB21 0ASB21 0ATB21 0AUB21 0AWB21 0AXB21 0AYB21 0BAB21 0BBB21 0BDB21 0BEB21 0BHB21 0BJB21 0BNB21 0BQB21 0BSB21 0DAB21 0DBB21 0DDB21 0DEB21 0DGB21 0DHB21 0DJB21 0DLB21 0DNB21 0DPB21 0DRB21 0DSB21 0EAB21 0EBB21 0EDB21 0EEB21 0EFB21 0EGB21 0EHB21 0EJB21 0ELB21 0ENB21 0EPB21 0ERB21 0ESB21 0ETB21 0EUB21 0EWB21 0EXB21 0EYB21 0EZB21 0HAB21 0HBB21 0HDB21 0HEB21 0HHB21 0HJB21 0HLB21 0HNB21 0HPB21 0HQB21 0HRB21 0HSB21 0HTB21 0HUB21 0HXB21 0HYB21 0HZB21 0JDB21 0JJB21 0JLB21 0JPB21 0JSB21 0LAB21 0LEB21 0LGB21 0LHB21 0LLB21 0LSB21 0LTB21 0NAB21 0NGB21 0NHB21 0NLB21 0NPB21 0NQB21 0NUB21 0PAB21 0PDB21 0PFB21 0PGB21 0PHB21 0PJB21 0PLB21 0PNB21 0PPB21 0PUB21 0PXB21 0QDB21 0QEB21 0QGB21 0QHB21 0QJB21 0QLB21 0QUB21 0QWB21 0QYB21 0RAB21 0RBB21 0RDB21 0REB21 0RGB21 0RHB21 0RJB21 0RLB21 0RNB21 0RSB21 0RWB21 0RYB21 0SAB21 0SBB21 0SDB21 0SEB21 0SFB21 0SGB21 0SHB21 0SJB21 0SLB21 0SNB21 0SQB21 0SUB21 0SXB21 0SYB21 0SZB21 0TAB21 0TBB21 0TDB21 0TEB21 0TGB21 0THB21 0TJB21 0TLB21 0TNB21 0TPB21 0TQB21 0TRB21 0TSB21 0TTB21 0TUB21 0TWB21 0UBB21 0UDB21 0UEB21 0UHB21 0UJB21 0ULB21 0UNB21 0UPB21 0UQB21 0URB21 0USB21 0UTB21 0UUB21 0UXB21 0UY

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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