Penygroes is a village in Gwynedd, Wales. The village is located to the south of Caernarfon, and north of Porthmadog, by the A487 road. Penygroes' population stands at 1,793 at the 2011 census, of which 88% are Welsh-speaking, making it one of the most predominantly Welsh-speaking areas of the country. The population of Llanllyfni community which includes Penygroes and Talysarn, is 4,135 according to the 2011 census.