|OS grid reference|
|Sovereign state||United Kingdom|
|Fire||Mid and West Wales|
The village of Llanllwni lies along the A485 highway, stretching for about 2.5 mi (4.0 km) along the road to the south-west of Llanybydder. Besides Llanllwni village, the community extends to the southern bank of the River Teifi and includes the summit of Mynydd Llanllwni, 1,338 ft (408 m) high. The community is bordered by the communities of: Llanybydder; Llanfihangel Rhos-y-Corn; and Llanfihangel-ar-Arth, all being in Carmarthenshire; and by Llandysul and Llanwenog in Ceredigion to the north of the River Teifi. The 2001 census recorded a population of 676, with 72.19% of the community able to speak some Welsh. The population taken at the 2011 Census had decreased to 638.
The 16th-century parish church, formerly dedicated to St. Llwni, is now dedicated to St. Luke and is a grade II* listed building. It is located on a wooded spur in a loop of the River Teifi and is a medieval building incorporating a mixture of Tudor-Gothic and of early nineteenth century Gothic styles, with a fine early sixteenth century tower.
To the north of the village are Norwood Gardens, which are open to the public for much of the year. To the south west of the village is the listed building and listed garden of Maesycrugiau Manor, rebuilt around 1900 after fire had destroyed much of the original Elizabethan castle. It was used as a hotel and for self-catering accommodation until 2015.
A plan to build a wind farm on Llanllwni Mountain with 21 wind turbines, each 127 m (417 ft) high, met with resistance from local residents. The planning application was turned down by Carmarthenshire County Council in November 2012, a decision confirmed by the Welsh Government in May 2014.
- "Community population 2011". Retrieved 15 April 2015.
- "Landranger 146: Lampeter, Llandovery & surrounding area". 1.25 inch map. Ordnance Survey.
- "Church of St Luke or St Llonio, Llanllwni". British Listed Buildings. Retrieved 27 April 2016.
- "Norwood Gardens and Tearoom". Norwood Gardens. Retrieved 27 April 2016.
- "Maesycrugiau Manor and Cottage". The Manor Hotel. Retrieved 27 April 2016.
- "Llanllwni wind farm plan rejected by Carmarthenshire councillors". BBC News. 20 November 2012. Retrieved 27 April 2016.
- "RES loses appeal over Llanllwni mountain wind farm plan". BBC News. 7 May 2014. Retrieved 27 April 2016.