Welcome to Llanaelhaearn Llanaelhaearn is a village and community in the Welsh county of Gwynedd, located on the Llŷn Peninsula. The community includes the village of Trefor, and had a population of 1,067 at the last census count, in 2001. Useful links Wikipedia entry for Llanaelhaearn Office for National Statistics : Census 2001 : Parish Headcounts : Gwynedd.