IP21 postcode district: Diss and around

IP21 is a postcode district mostly in Suffolk, with 530 postcodes in use in 2 sectors. It has postcodes in Diss. It is split between 2 councils: Mid Suffolk (302 postcodes) and South Norfolk (228). 302 are in Suffolk and 228 in Norfolk.

Postcodes in use
530
Sectors
2
Councils
2 councils
Places
Diss

Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026. See all our data sources

Every postcode in IP21, by flood risk

Map of every postcode in IP21, by flood risk Of the 530 postcodes in IP21 that ONS places, 25 have a home or business at high risk, 5 are at medium risk at worst, 10 are at low risk at worst and 490 are not on the Environment Agency's at-risk list. Places named: Diss, Harleston, Eye, Mid Suffolk. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2.5 km. A140 IP21 4AA: not on the flood risk listIP21 4AB: not on the flood risk listIP21 4AD: not on the flood risk listIP21 4AE: not on the flood risk listIP21 4AF: not on the flood risk listIP21 4AG: not on the flood risk listIP21 4AH: not on the flood risk listIP21 4AL: not on the flood risk listIP21 4AN: not on the flood risk listIP21 4AP: not on the flood risk listIP21 4AR: not on the flood risk listIP21 4AS: not on the flood risk listIP21 4AT: not on the flood risk listIP21 4AU: not on the flood risk listIP21 4AW: not on the flood risk listIP21 4AX: not on the flood risk listIP21 4AY: not on the flood risk listIP21 4AZ: not on the flood risk listIP21 4BB: not on the flood risk listIP21 4BD: not on the flood risk listIP21 4BE: not on the flood risk listIP21 4BH: not on the flood risk listIP21 4BJ: not on the flood risk listIP21 4BL: not on the flood risk listIP21 4BN: not on the flood risk listIP21 4BP: not on the flood risk listIP21 4BQ: not on the flood risk listIP21 4BS: not on the flood risk listIP21 4BT: not on the flood risk listIP21 4BU: not on the flood risk listIP21 4BW: not on the flood risk listIP21 4BX: not on the flood risk listIP21 4BY: not on the flood risk listIP21 4BZ: not on the flood risk listIP21 4DB: not on the flood risk listIP21 4DD: not on the flood risk listIP21 4DF: not on the flood risk listIP21 4DR: not on the flood risk listIP21 4DS: not on the flood risk listIP21 4DT: not on the flood risk listIP21 4DU: not on the flood risk listIP21 4DW: not on the flood risk listIP21 4DX: not on the flood risk listIP21 4DZ: not on the flood risk listIP21 4EA: not on the flood risk listIP21 4ED: not on the flood risk listIP21 4EE: not on the flood risk listIP21 4EF: not on the flood risk listIP21 4EG: not on the flood risk listIP21 4EJ: not on the flood risk listIP21 4EL: not on the flood risk listIP21 4EP: not on the flood risk listIP21 4EQ: not on the flood risk listIP21 4ER: not on the flood risk listIP21 4ES: not on the flood risk listIP21 4ET: not on the flood risk listIP21 4EW: not on the flood risk listIP21 4EY: not on the flood risk listIP21 4EZ: not on the flood risk listIP21 4FA: not on the flood risk listIP21 4FB: not on the flood risk listIP21 4FD: not on the flood risk listIP21 4FE: not on the flood risk listIP21 4FF: not on the flood risk listIP21 4FG: not on the flood risk listIP21 4FH: not on the flood risk listIP21 4FZ: not on the flood risk listIP21 4GN: not on the flood risk listIP21 4HB: not on the flood risk listIP21 4HD: not on the flood risk listIP21 4HE: not on the flood risk listIP21 4HG: not on the flood risk listIP21 4HH: not on the flood risk listIP21 4HJ: not on the flood risk listIP21 4HN: not on the flood risk listIP21 4HP: not on the flood risk listIP21 4HR: not on the flood risk listIP21 4HS: not on the flood risk listIP21 4HT: not on the flood risk listIP21 4HU: not on the flood risk listIP21 4HW: not on the flood risk listIP21 4HX: not on the flood risk listIP21 4HY: not on the flood risk listIP21 4HZ: not on the flood risk listIP21 4JA: not on the flood risk listIP21 4JB: not on the flood risk listIP21 4JD: not on the flood risk listIP21 4JG: not on the flood risk listIP21 4JR: not on the flood risk listIP21 4JS: not on the flood risk listIP21 4JT: not on the flood risk listIP21 4JU: not on the flood risk listIP21 4JX: not on the flood risk listIP21 4LD: not on the flood risk listIP21 4LL: not on the flood risk listIP21 4LN: not on the flood risk listIP21 4LP: not on the flood risk listIP21 4LR: not on the flood risk listIP21 4LS: not on the flood risk listIP21 4LT: not on the flood risk listIP21 4LU: not on the flood risk listIP21 4LW: not on the flood risk listIP21 4LX: not on the flood risk listIP21 4LY: not on the flood risk listIP21 4LZ: not on the flood risk listIP21 4NA: not on the flood risk listIP21 4NB: not on the flood risk listIP21 4NE: not on the flood risk listIP21 4NG: not on the flood risk listIP21 4NH: not on the flood risk listIP21 4NJ: not on the flood risk listIP21 4NL: not on the flood risk listIP21 4NN: not on the flood risk listIP21 4NP: not on the flood risk listIP21 4NS: not on the flood risk listIP21 4NT: not on the flood risk listIP21 4NU: not on the flood risk listIP21 4NW: not on the flood risk listIP21 4NX: not on the flood risk listIP21 4NY: not on the flood risk listIP21 4NZ: not on the flood risk listIP21 4PB: not on the flood risk listIP21 4PD: not on the flood risk listIP21 4PE: not on the flood risk listIP21 4PF: not on the flood risk listIP21 4PG: not on the flood risk listIP21 4PH: not on the flood risk listIP21 4PJ: not on the flood risk listIP21 4PL: not on the flood risk listIP21 4PP: not on the flood risk listIP21 4PQ: not on the flood risk listIP21 4PR: not on the flood risk listIP21 4PS: not on the flood risk listIP21 4PT: not on the flood risk listIP21 4PW: not on the flood risk listIP21 4QA: not on the flood risk listIP21 4QB: not on the flood risk listIP21 4QD: not on the flood risk listIP21 4QF: not on the flood risk listIP21 4QG: not on the flood risk listIP21 4QH: not on the flood risk listIP21 4QJ: not on the flood risk listIP21 4QL: not on the flood risk listIP21 4QP: not on the flood risk listIP21 4QQ: not on the flood risk listIP21 4QR: not on the flood risk listIP21 4QU: not on the flood risk listIP21 4QX: not on the flood risk listIP21 4QY: not on the flood risk listIP21 4QZ: not on the flood risk listIP21 4RA: not on the flood risk listIP21 4RD: not on the flood risk listIP21 4RE: not on the flood risk listIP21 4RF: not on the flood risk listIP21 4RG: not on the flood risk listIP21 4RH: not on the flood risk listIP21 4RJ: not on the flood risk listIP21 4RL: not on the flood risk listIP21 4RN: not on the flood risk listIP21 4RP: not on the flood risk listIP21 4RR: not on the flood risk listIP21 4RT: not on the flood risk listIP21 4RX: not on the flood risk listIP21 4SH: not on the flood risk listIP21 4SL: not on the flood risk listIP21 4SN: not on the flood risk listIP21 4SS: not on the flood risk listIP21 4SY: not on the flood risk listIP21 4SZ: not on the flood risk listIP21 4TE: not on the flood risk listIP21 4TF: not on the flood risk listIP21 4TG: not on the flood risk listIP21 4TH: not on the flood risk listIP21 4TJ: not on the flood risk listIP21 4TL: not on the flood risk listIP21 4TN: not on the flood risk listIP21 4TP: not on the flood risk listIP21 4TQ: not on the flood risk listIP21 4TS: not on the flood risk listIP21 4UA: not on the flood risk listIP21 4UB: not on the flood risk listIP21 4UD: not on the flood risk listIP21 4UE: not on the flood risk listIP21 4UF: not on the flood risk listIP21 4WZ: not on the flood risk listIP21 4XA: not on the flood risk listIP21 4XB: not on the flood risk listIP21 4XE: not on the flood risk listIP21 4XF: not on the flood risk listIP21 4XG: not on the flood risk listIP21 4XH: not on the flood risk listIP21 4XJ: not on the flood risk listIP21 4XL: not on the flood risk listIP21 4XN: not on the flood risk listIP21 4XP: not on the flood risk listIP21 4XQ: not on the flood risk listIP21 4XS: not on the flood risk listIP21 4XT: not on the flood risk listIP21 4XU: not on the flood risk listIP21 4XW: not on the flood risk listIP21 4XX: not on the flood risk listIP21 4XY: not on the flood risk listIP21 4XZ: not on the flood risk listIP21 4YA: not on the flood risk listIP21 4YB: not on the flood risk listIP21 4YD: not on the flood risk listIP21 4YF: not on the flood risk listIP21 4YG: not on the flood risk listIP21 4YH: not on the flood risk listIP21 4YJ: not on the flood risk listIP21 4YL: not on the flood risk listIP21 5AA: not on the flood risk listIP21 5AB: not on the flood risk listIP21 5AD: not on the flood risk listIP21 5AE: not on the flood risk listIP21 5AG: not on the flood risk listIP21 5AJ: not on the flood risk listIP21 5AQ: not on the flood risk listIP21 5AU: not on the flood risk listIP21 5AX: not on the flood risk listIP21 5AZ: not on the flood risk listIP21 5BA: not on the flood risk listIP21 5BD: not on the flood risk listIP21 5BE: not on the flood risk listIP21 5BH: not on the flood risk listIP21 5BN: not on the flood risk listIP21 5BT: not on the flood risk listIP21 5BW: not on the flood risk listIP21 5BX: not on the flood risk listIP21 5BY: not on the flood risk listIP21 5BZ: not on the flood risk listIP21 5DA: not on the flood risk listIP21 5DB: not on the flood risk listIP21 5DD: not on the flood risk listIP21 5DE: not on the flood risk listIP21 5DF: not on the flood risk listIP21 5DH: not on the flood risk listIP21 5DJ: not on the flood risk listIP21 5DL: not on the flood risk listIP21 5DN: not on the flood risk listIP21 5DP: not on the flood risk listIP21 5DQ: not on the flood risk listIP21 5DT: not on the flood risk listIP21 5DU: not on the flood risk listIP21 5DW: not on the flood risk listIP21 5DX: not on the flood risk listIP21 5DY: not on the flood risk listIP21 5DZ: not on the flood risk listIP21 5EA: not on the flood risk listIP21 5EB: not on the flood risk listIP21 5ED: not on the flood risk listIP21 5EE: not on the flood risk listIP21 5EG: not on the flood risk listIP21 5EH: not on the flood risk listIP21 5EJ: not on the flood risk listIP21 5EL: not on the flood risk listIP21 5EP: not on the flood risk listIP21 5ER: not on the flood risk listIP21 5ES: not on the flood risk listIP21 5ET: not on the flood risk listIP21 5EU: not on the flood risk listIP21 5EW: not on the flood risk listIP21 5EX: not on the flood risk listIP21 5EY: not on the flood risk listIP21 5EZ: not on the flood risk listIP21 5FA: not on the flood risk listIP21 5FE: not on the flood risk listIP21 5HD: not on the flood risk listIP21 5HE: not on the flood risk listIP21 5HG: not on the flood risk listIP21 5HH: not on the flood risk listIP21 5HJ: not on the flood risk listIP21 5HL: not on the flood risk listIP21 5HP: not on the flood risk listIP21 5HQ: not on the flood risk listIP21 5HR: not on the flood risk listIP21 5HS: not on the flood risk listIP21 5HU: not on the flood risk listIP21 5HW: not on the flood risk listIP21 5HY: not on the flood risk listIP21 5HZ: not on the flood risk listIP21 5JB: not on the flood risk listIP21 5JD: not on the flood risk listIP21 5JE: not on the flood risk listIP21 5JF: not on the flood risk listIP21 5JG: not on the flood risk listIP21 5JH: not on the flood risk listIP21 5JL: not on the flood risk listIP21 5JN: not on the flood risk listIP21 5JP: not on the flood risk listIP21 5JR: not on the flood risk listIP21 5JS: not on the flood risk listIP21 5JT: not on the flood risk listIP21 5JW: not on the flood risk listIP21 5JX: not on the flood risk listIP21 5LA: not on the flood risk listIP21 5LB: not on the flood risk listIP21 5LD: not on the flood risk listIP21 5LE: not on the flood risk listIP21 5LF: not on the flood risk listIP21 5LG: not on the flood risk listIP21 5LH: not on the flood risk listIP21 5LP: not on the flood risk listIP21 5LR: not on the flood risk listIP21 5LS: not on the flood risk listIP21 5LT: not on the flood risk listIP21 5LU: not on the flood risk listIP21 5LW: not on the flood risk listIP21 5LX: not on the flood risk listIP21 5LY: not on the flood risk listIP21 5NA: not on the flood risk listIP21 5NB: not on the flood risk listIP21 5ND: not on the flood risk listIP21 5NE: not on the flood risk listIP21 5NF: not on the flood risk listIP21 5NG: not on the flood risk listIP21 5NH: not on the flood risk listIP21 5NJ: not on the flood risk listIP21 5NL: not on the flood risk listIP21 5NN: not on the flood risk listIP21 5NP: not on the flood risk listIP21 5NR: not on the flood risk listIP21 5NZ: not on the flood risk listIP21 5PA: not on the flood risk listIP21 5PD: not on the flood risk listIP21 5PG: not on the flood risk listIP21 5PH: not on the flood risk listIP21 5PJ: not on the flood risk listIP21 5PL: not on the flood risk listIP21 5PN: not on the flood risk listIP21 5PP: not on the flood risk listIP21 5PQ: not on the flood risk listIP21 5PS: not on the flood risk listIP21 5PX: not on the flood risk listIP21 5PY: not on the flood risk listIP21 5QE: not on the flood risk listIP21 5QF: not on the flood risk listIP21 5QG: not on the flood risk listIP21 5QJ: not on the flood risk listIP21 5QL: not on the flood risk listIP21 5QN: not on the flood risk listIP21 5QP: not on the flood risk listIP21 5QR: not on the flood risk listIP21 5QS: not on the flood risk listIP21 5QT: not on the flood risk listIP21 5QX: not on the flood risk listIP21 5QY: not on the flood risk listIP21 5QZ: not on the flood risk listIP21 5RA: not on the flood risk listIP21 5RB: not on the flood risk listIP21 5RE: not on the flood risk listIP21 5RF: not on the flood risk listIP21 5RG: not on the flood risk listIP21 5RH: not on the flood risk listIP21 5RJ: not on the flood risk listIP21 5RL: not on the flood risk listIP21 5RP: not on the flood risk listIP21 5RR: not on the flood risk listIP21 5RS: not on the flood risk listIP21 5SA: not on the flood risk listIP21 5SB: not on the flood risk listIP21 5SD: not on the flood risk listIP21 5SE: not on the flood risk listIP21 5SF: not on the flood risk listIP21 5SG: not on the flood risk listIP21 5SJ: not on the flood risk listIP21 5SL: not on the flood risk listIP21 5SN: not on the flood risk listIP21 5ST: not on the flood risk listIP21 5SX: not on the flood risk listIP21 5SY: not on the flood risk listIP21 5SZ: not on the flood risk listIP21 5TA: not on the flood risk listIP21 5TB: not on the flood risk listIP21 5TE: not on the flood risk listIP21 5TF: not on the flood risk listIP21 5TG: not on the flood risk listIP21 5TH: not on the flood risk listIP21 5TJ: not on the flood risk listIP21 5TP: not on the flood risk listIP21 5TQ: not on the flood risk listIP21 5TR: not on the flood risk listIP21 5TT: not on the flood risk listIP21 5TX: not on the flood risk listIP21 5TY: not on the flood risk listIP21 5TZ: not on the flood risk listIP21 5UB: not on the flood risk listIP21 5UD: not on the flood risk listIP21 5UF: not on the flood risk listIP21 5UH: not on the flood risk listIP21 5UJ: not on the flood risk listIP21 5UL: not on the flood risk listIP21 5UX: not on the flood risk listIP21 5UY: not on the flood risk listIP21 4AJ: low flood risk at worstIP21 4BF: low flood risk at worstIP21 4DL: low flood risk at worstIP21 4DP: low flood risk at worstIP21 4JY: low flood risk at worstIP21 4UH: low flood risk at worstIP21 5AP: low flood risk at worstIP21 5EF: low flood risk at worstIP21 5UA: low flood risk at worstIP21 4NR: medium flood risk at worstIP21 4UJ: medium flood risk at worstIP21 4XR: medium flood risk at worstIP21 5QB: medium flood risk at worstIP21 5TD: medium flood risk at worstIP21 4DH: high flood riskIP21 4DJ: high flood riskIP21 4JL: high flood riskIP21 4JP: high flood riskIP21 4JW: high flood riskIP21 4LA: high flood riskIP21 4QS: high flood riskIP21 4QT: high flood riskIP21 4RZ: high flood riskIP21 4UL: high flood riskIP21 4UU: high flood riskIP21 5AL: high flood riskIP21 5AN: high flood riskIP21 5AR: high flood riskIP21 5AS: high flood riskIP21 5AY: high flood riskIP21 5BB: high flood riskIP21 5BP: high flood riskIP21 5BS: high flood riskIP21 5DG: high flood riskIP21 5PF: high flood riskIP21 5NQ: high flood riskIP21 5PE: high flood riskIP21 5SH: high flood riskIP21 5UE: high flood risk DissHarlestonEye, Mid Suffolk Map of every postcode in IP21, by flood risk Of the 530 postcodes in IP21 that ONS places, 25 have a home or business at high risk, 5 are at medium risk at worst, 10 are at low risk at worst and 490 are not on the Environment Agency's at-risk list. Places named: Diss, Harleston, Eye, Mid Suffolk. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 5 km. A140 DissHarlestonEye, Mid Suffolk
  • A home or business at high risk: 25
  • At medium risk at worst: 5
  • At low risk at worst: 10
  • At very low risk only: 0
  • Not on the at-risk list: 490

Of the 530 postcodes in IP21 that ONS places, 25 have a home or business at high risk, 5 are at medium risk at worst, 10 are at low risk at worst and 490 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.

The middle of its postcodes: latitude 52.3645, longitude 1.2370. Open this area on OpenStreetMap

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

25 postcodes here have a home or business at high risk. These are the 12 with the most homes and businesses at that risk.

Beside each: how many of its homes and businesses the Environment Agency puts at that risk.

IP21 4JP11 at high riskIP21 4JW9 at high riskIP21 5AR8 at high riskIP21 4LA5 at high riskIP21 4UL5 at high riskIP21 5AN4 at high riskIP21 5AY4 at high riskIP21 5PF3 at high riskIP21 5SH3 at high riskIP21 4JL3 at high riskIP21 5BB3 at high riskIP21 4DJ2 at high risk

What broadband can you get in IP21?

Ofcom reports on 525 of the 530 postcodes in IP21. At 199 of them every home and business can get gigabit broadband, and at 18 some cannot get decent broadband (10 Mbit/s).

Postcodes where every home can get gigabit199 of 525
Postcodes where every home can get superfast410 of 525
Postcodes where some cannot get decent broadband18 of 525

Ofcom gives each postcode's share of homes and businesses, not how many there are, so these count postcodes. Each postcode page has its own figures. A provider's checker answers for one address.

Check one address on Ofcom's checker

Source: Ofcom, Connected Nations, Spring 2026, data for January 2026, Open Government Licence v3.0. How we use it

Is IP21 at risk of flooding?

40 of the 530 postcodes in IP21 have a home or business in an area at risk of flooding from rivers or the sea, the Environment Agency says. At those, it puts 91 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 40 of 530 postcodes High: 78Medium: 13Low: 60

High: 3.3% or more a year (1 in 30). Medium: 1% to 3.3% a year. Low: 0.1% to 1% a year. Very low: under 0.1% a year (1 in 1,000). Each band is the chance of flooding in any one year.

Homes and businesses in an area at risk of flooding from rivers or the sea, as the Environment Agency counts them, added up over the postcodes. It is for the land, not each building, and leaves out surface water, groundwater and sewers. Each postcode page has its own figures and its flood warning areas.

Source: Environment Agency, Risk of Flooding from Rivers and Sea (postcodes in areas at risk), published 6 July 2026, Open Government Licence v3.0. How we use it

What do homes sell for in IP21?

Homes in IP21 sold for a typical £350,000 in the 12 months to August 2026, across 131 sales, up 9.4% on the 12 months before, HM Land Registry's figures show.

£350,000 typical price, the 12 months to August 2026
£320,000 12 months to August 2025
▲ up 9.4% on the 12 months before
  • Detached £468,000 83 sales
  • Semi-detached £257,500 35 sales
  • Terraced £225,000 11 sales
  • Flat or maisonette 2 sales, too few to price

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

Standard sales of homes at market value. A typical price is the median, the middle sale. Sales take weeks to be registered, so the last month or two are incomplete. Each postcode page gives the figure for its own postcode sector.

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 IP21

Pick a sector, then a postcode. A sector is the district plus the next digit.

IP21 4276 postcodesIP21 5254 postcodes
UK postcode format explained

Places in IP21

Towns and villages with postcodes in IP21, and how many each has here.

Diss postcodes,3

Who covers IP21

How many of the district's postcodes in use fall under each council, constituency and police force area.

Councils

What council am I in?

Constituencies

  • Waveney Valley530

Police force areas

  • Suffolk302
  • Norfolk228

Next to IP21

IP20 postcode district IP22 postcode district All IP districts Diss postcodes

"Next to" is by number: the districts before and after IP21 in the IP area.

Check a postcode

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