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