The (now closed) steel-works in nearby Bynea was a major employer until the decline of the steel industry.

The village is 50 ft above sea level and is based around the Nant Caerhuan that finds its source in nearby Gelli Farm, Bryn, Llanelli.

This may have carried on into the early Middle Ages as the village may have bordered the regions of Ystrad Tywi and Glywysing.

Cwmcarnhywel and Cefncaeau estates are locally known as the Top or bottom site (Welsh-Maesydd Pen a Gwaelod) and they are villages of their own, but are sometimes considered part of Llwynhendy.

Before baptism was legal in Great Britain, the baptists of the Llwynhendy area used to meet in Tŷ Cwrdd Farm (lit.