It is located in the countryside above the valley of the River Tywi, about halfway between Llanymddyfri (or Llandovery) to the north-east, and Llandeilo to the south-west. It is just off the A40 road, between Carmarthen (about 20 miles SW) and Brecon (abouit 25 miles E). The community is bordered by the communities of: Cynwyl Gaeo; Llanwrda; Myddfai; Llangadog; Manordeilo and Salem; and Talley; all of these are in Carmarthenshire.
- "Community population 2011". Retrieved 13 April 2015.
|Wikimedia Commons has media related to Llansadwrn.|
- www.geograph.co.uk : photos of Llansadwrn and surrounding area
- https://www.llansadwrn.org.uk/ community website
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