Hertfordshire yw konteth yn Pow Sows.
Contethow gwrys kyns 1889: Bedfordshire • Berkshire • Buckinghamshire • Cargront • Cheshire • Cumberland • Derbyshire • Dewnans • Dorset • Durham • Essex • Evrek • Gloucestershire • Gwlas an Hav • Hampshire • Herefordshire • Hertfordshire • Huntingdonshire • Kernow • Kint • Lancashire • Leicestershire • Lincolnshire • Menow • Middlesex • Norfolk • Northamptonshire • Northumberland • Nottinghamshire • Rysoghen • Rutland • Shropshire • Staffordshire • Suffolk • Surrey • Sussex • Warwickshire • Westmorland • Wiltshire • Worcestershire