The Commission has determined that a county constituency be created from:The Dwyfor Meirionnydd UK Parliamentary constituency,and:The Montgomeryshire and Glyndŵr UK Parliamentary constituency.
Mae’r Comisiwn wedi penderfynu creu etholaeth sirol o’r canlynol:Etholaeth Seneddol y Deyrnas Unedig Dwyfor Meirionnydd,ac:Etholaeth Seneddol y Deyrnas Unedig Sir Drefaldwyn a Glyndŵr.