'''Jeffreyston''' zo ur [[Roll kumuniezhioù Kembre|gumuniezh]] e kontelezh [[Sir Benfro]], [[Kembre]], 227.,6km eus [[Kerdiz]].<ref>[http://www.e-gymraeg.org/enwaucymru/chwilio.aspx Enwau Lleoedd; Canolfan Bedwyr]</ref> E 2011 e oa poblet gant 560 a dud, ha 69 anezho (12.,3%) a oa kembraegerien.<ref>{{cite web| url=http://www.ons.gov.uk/ons/rel/census/2011-census/key-statistics-for-unitary-authorities-in-wales/stb-2011-census-key-statistics-for-wales.html| title=''Statistical bulletin: 2011 Census: Key Statistics for Wales, Mawrth 2011''| publisher=Swyddfa Ystadegau Cenedlaethol (''The Office For National Statistics| accessdate=2014-04-09}}</ref>
