Ysgol Gynradd Gwaun Gynfi provides Welsh-medium education for children between 3 and 11 years in the village.

The settlements now known as Deiniolen and Clwt-y-Bont began in the 1820s based along the road and railway to the nearby Dinorwig Quarry.

In the 1920s, after a campaign led by Huw Robert Jones, the village adopted its current name of Deiniolen.

Most recent success includes a third place at the National Brass Band Championships in 2015 and coming second at North Wales Rally (Open Section) in 2017.

Deiniolen FC was formed in around the 1950s when the side was playing in the local Caernarfon & District League.