SA4 postcode district: Gorseinon and around

SA4 is a postcode district in Wales, with 1,150 postcodes in use in 7 sectors. It has postcodes in Gorseinon, Pontarddulais, Penllergaer and 4 more places. It is split between 2 councils: Swansea (1,059 postcodes) and Carmarthenshire (91).

Postcodes in use: 1,150
Sectors: 7
Councils: 2 councils
Places: 7 places

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

Every postcode in SA4, and which are new since 2020

New since 2020: 50
In use before 2020: 1,100
Outline: where 5 or more new postcodes since 2020 lie together

Of the 1,150 postcodes in SA4 that ONS places, 50 are new since 2020 and 1,100 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. A dashed outline shows where 5 or more lie within 180 metres of each other. It is not a boundary, and 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 51.6732, longitude -4.0482. 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

SA4 4HUJune 2026 SA4 5EHJune 2026 SA4 9FJJune 2026 SA4 5EGMarch 2026 SA4 9HLMarch 2026

Where the new postcodes lie together

8 new postcodes since 2020, outlined on the map. SA4 9HH, is the newest of them.
7 new postcodes since 2020, outlined on the map. SA4 9HT, is the newest of them.
6 new postcodes since 2020, outlined on the map. SA4 4HU, is the newest of them.
6 new postcodes since 2020, outlined on the map. SA4 5EH, is the newest of them.

What broadband can you get in SA4?

Ofcom reports on 1,117 of the 1,150 postcodes in SA4. At 813 of them every home and business can get gigabit broadband, and at 10 some cannot get decent broadband (10 Mbit/s).

Postcodes where every home can get gigabit813 of 1,117

Postcodes where every home can get superfast991 of 1,117

Postcodes where some cannot get decent broadband10 of 1,117

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 SA4?

Homes in SA4 sold for a typical £220,000 in the 12 months to August 2026, across 529 sales, down 2.7% on the 12 months before, HM Land Registry's figures show.

£220,000 typical price, the 12 months to August 2026

£226,000 12 months to August 2025

▼ down 2.7% on the 12 months before

Detached £315,000 173 sales
Semi-detached £210,000 226 sales
Terraced £167,000 99 sales
Flat or maisonette £105,000 31 sales

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