It was the western terminus of the Tanat Valley Light Railway (Llynclys - Llangynog) (15 miles); it opened on 5 January 1904 and closed (passenger traffic) in 1951.
Llangynog's population was 339, according to the 2011 census;[1] a 5.60% increase since the 321 people noted in 2001.[2]
The 2011 census showed 36.7% of the population could speak Welsh, a fall from 50.6% in 2001, reportedly due to an influx of residents from the West Midlands.[3]