Ynyswen is a village in Rhondda Cynon Taf, Wales.
It is situated within the SA9 postcode district, which is within the Swansea post town.
The full list of postcode districts within the Swansea post town is as follows:
The Swansea post town is within the Swansea postcode area.
Administrative Ward: Tawe-Uchaf
Administrative District: Powys
Country: Wales
UK Parliament: Brecon and Radnorshire