 It comprised the parishes of Bettws, Bishton, Coedkernew, Duffryn, Goldcliff, Graig, Henllys, Kemeys Inferior, Langstone, Llandevenny, Llanmartin, Llanwern, Llanvaches, Machen Lower, Magor, Marshfield, Michaelstone-y-Fedw, Nash, Penhow, Peterstone Wentloog, Rogerstone, Rumney, St Brides Wentloog, St Mellons, Redwick, Whitson and Wilcrick.In 1938 the parish of Rumney was removed from the Rural District to become part of the county borough of Cardiff, in the neighbouring county of Glamorgan, although it remained part of Monmouthshire, and England.The Rural District Council comprised a number of councillors and a chairman.