SY18 postcode district: Llanidloes and around, Powys

SY18 is a postcode district in Wales, with 226 postcodes in use in 2 sectors. It has postcodes in Llanidloes. Its council is Powys. ONS gives no location for 1 of its postcodes, and so no council.

Postcodes in use
226
Sectors
2
Council
Powys
Places
Llanidloes

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

Every postcode in SY18, and which are new since 2020

Map of every postcode in SY18, by new since 2020 Of the 225 postcodes in SY18 that ONS places, 8 are new since 2020 and 217 were in use before 2020. Places named: Llanidloes. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2.5 km. SY18 6AA: before 2020SY18 6AB: before 2020SY18 6AD: before 2020SY18 6AJ: before 2020SY18 6AL: before 2020SY18 6AP: before 2020SY18 6AQ: before 2020SY18 6AR: before 2020SY18 6AS: before 2020SY18 6AX: before 2020SY18 6AZ: before 2020SY18 6BA: before 2020SY18 6BB: before 2020SY18 6BF: before 2020SY18 6BG: before 2020SY18 6BJ: before 2020SY18 6BQ: before 2020SY18 6BU: before 2020SY18 6DA: before 2020SY18 6DD: before 2020SY18 6DH: before 2020SY18 6DN: before 2020SY18 6DP: before 2020SY18 6DQ: before 2020SY18 6DT: before 2020SY18 6DU: before 2020SY18 6DW: before 2020SY18 6EH: before 2020SY18 6EN: before 2020SY18 6ES: before 2020SY18 6ET: before 2020SY18 6EU: before 2020SY18 6EX: before 2020SY18 6FE: before 2020SY18 6HA: before 2020SY18 6HB: before 2020SY18 6HD: before 2020SY18 6HG: before 2020SY18 6HL: before 2020SY18 6HP: before 2020SY18 6HR: before 2020SY18 6HT: before 2020SY18 6HU: before 2020SY18 6HW: before 2020SY18 6HY: before 2020SY18 6HZ: before 2020SY18 6JA: before 2020SY18 6JB: before 2020SY18 6JD: before 2020SY18 6JH: before 2020SY18 6JJ: before 2020SY18 6JL: before 2020SY18 6JN: before 2020SY18 6JP: before 2020SY18 6JQ: before 2020SY18 6JR: before 2020SY18 6JS: before 2020SY18 6JT: before 2020SY18 6JU: before 2020SY18 6JW: before 2020SY18 6JX: before 2020SY18 6JY: before 2020SY18 6JZ: before 2020SY18 6LA: before 2020SY18 6LE: before 2020SY18 6LG: before 2020SY18 6LH: before 2020SY18 6LJ: before 2020SY18 6LL: before 2020SY18 6LN: before 2020SY18 6LP: before 2020SY18 6LQ: before 2020SY18 6LR: before 2020SY18 6LS: before 2020SY18 6LT: before 2020SY18 6LU: before 2020SY18 6LW: before 2020SY18 6LX: before 2020SY18 6NA: before 2020SY18 6NB: before 2020SY18 6ND: before 2020SY18 6NE: before 2020SY18 6NF: before 2020SY18 6NG: before 2020SY18 6NH: before 2020SY18 6NJ: before 2020SY18 6NL: before 2020SY18 6NN: before 2020SY18 6NP: before 2020SY18 6NQ: before 2020SY18 6NR: before 2020SY18 6NS: before 2020SY18 6NT: before 2020SY18 6NU: before 2020SY18 6NW: before 2020SY18 6NX: before 2020SY18 6NY: before 2020SY18 6NZ: before 2020SY18 6PG: before 2020SY18 6PH: before 2020SY18 6PJ: before 2020SY18 6PL: before 2020SY18 6PN: before 2020SY18 6PP: before 2020SY18 6PQ: before 2020SY18 6PR: before 2020SY18 6PS: before 2020SY18 6PT: before 2020SY18 6PW: before 2020SY18 6QA: before 2020SY18 6QB: before 2020SY18 6QD: before 2020SY18 6QE: before 2020SY18 6QF: before 2020SY18 6QG: before 2020SY18 6QH: before 2020SY18 6QJ: before 2020SY18 6QL: before 2020SY18 6QN: before 2020SY18 6QQ: before 2020SY18 6QT: before 2020SY18 6QU: before 2020SY18 6QX: before 2020SY18 6QY: before 2020SY18 6RA: before 2020SY18 6RB: before 2020SY18 6RE: before 2020SY18 6RF: before 2020SY18 6RG: before 2020SY18 6RJ: before 2020SY18 6RL: before 2020SY18 6RN: before 2020SY18 6RP: before 2020SY18 6RQ: before 2020SY18 6RR: before 2020SY18 6RS: before 2020SY18 6RT: before 2020SY18 6RU: before 2020SY18 6RX: before 2020SY18 6RY: before 2020SY18 6RZ: before 2020SY18 6SA: before 2020SY18 6SB: before 2020SY18 6SJ: before 2020SY18 6SL: before 2020SY18 6SN: before 2020SY18 6SQ: before 2020SY18 6SU: before 2020SY18 6SW: before 2020SY18 6SX: before 2020SY18 6SY: before 2020SY18 6SZ: before 2020SY18 6TA: before 2020SY18 6YR: before 2020SY18 6DG: new since 2020SY18 6FD: new since 2020SY18 6FF: new since 2020SY18 6FH: new since 2020SY18 6FJ: new since 2020SY18 6PA: new since 2020SY18 6FG: new since 2020SY18 6FB: new since 2020 Llanidloes Map of every postcode in SY18, by new since 2020 Of the 225 postcodes in SY18 that ONS places, 8 are new since 2020 and 217 were in use before 2020. Places named: Llanidloes. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2.5 km. Llanidloes
  • New since 2020: 8
  • In use before 2020: 217

Of the 225 postcodes in SY18 that ONS places, 8 are new since 2020 and 217 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.

The middle of its postcodes: latitude 52.4418, longitude -3.5493. 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; 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

The 5 newest postcodes

SY18 6FJJanuary 2026SY18 6FHJuly 2024SY18 6FGNovember 2022SY18 6DGAugust 2022SY18 6PAAugust 2022

What broadband can you get in SY18?

Ofcom reports on 220 of the 226 postcodes in SY18. At 124 of them every home and business can get gigabit broadband, and at 33 some cannot get decent broadband (10 Mbit/s).

Postcodes where every home can get gigabit124 of 220
Postcodes where every home can get superfast144 of 220
Postcodes where some cannot get decent broadband33 of 220

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

What do homes sell for in SY18?

Homes in SY18 sold for a typical £205,000 in the 12 months to August 2026, across 36 sales, down 6.1% on the 12 months before, HM Land Registry's figures show.

£205,000 typical price, the 12 months to August 2026
£218,250 12 months to August 2025
▼ down 6.1% on the 12 months before
  • Detached £360,000 15 sales
  • Semi-detached £245,000 7 sales
  • Terraced £161,500 12 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 SY18

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

SY18 6225 postcodesSY18 91 postcode
UK postcode format explained

Places in SY18

Towns and villages with postcodes in SY18, and how many each has here.

Llanidloes postcodes,117

Who covers SY18

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

  • Montgomeryshire and Glyndwr221
  • Brecon, Radnor and Cwm Tawe4

Police force areas

  • Dyfed-Powys225

Next to SY18

SY17 postcode district SY19 postcode district All SY districts Llanidloes postcodes

"Next to" is by number: the districts before and after SY18 in the SY area.

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