[3] The modern spelling of Ynysybwl suggests that the second element may be "bŵl" (meaning a bowl or bowl-shaped) in reference to the shape of the river-meadow or the valley itself.

[4] Thomas Morgan stated that he believed that Ynysybwl was a corruption of "Ynys-y-bêl" (the meadow of the ball) in reference to its long history as a meeting place for ballgames.

[8] Following a local government boundary review, the number of councillors was increased to two, effective from the 2022 Rhondda Cynon Taf County Borough Council election.

[11] The rich seams of coal in the Mynachdy level that lie beneath the surface had thus far only been tapped to the amount required to supply these local farms.

However coal mining fell out of favour with many people, including politicians, and the Lady Windsor Colliery did not escape the troubles that plagued the industry during the miners' strikes of the early 1980s.

Despite the pit closure, the village has survived, people finding work in the newly developing industries in nearby Pontypridd, Treforest, Aberdare, Caerphilly, Merthyr Tydfil and Cardiff.

This led to the formation of the Ynysybwl Regeneration Partnership, an umbrella group formed to help achieve funding and organisation for activities within the village.

The Recreation Ground is the home to many of the village's sporting clubs, hosting rugby, football, cricket and bowls as well as incorporating a large playing area.