The Old Hamlet of Llanmartin lies within the ward of Langstone and falls under the jurisdiction of Newport City Council. It is an active rural farming community. It lies between the eastern boundary of Langstone to the village of Wilcrick It extends north to Llandevaud. Residents enjoy the peace and quiet of the countryside with its diversity of wild life but the M4 motorway is only two miles away and the Severn Bridge can be seen from many homes.
At its centre is the Hamlet Green created by the residents from old waste ground. It has a parish church. a castle -currently being restored to a family residence, a country pub and restaurant, commercial stables, an ironworks craft centre at Oakdale and another in the grounds of Pencoed Castle. On a small Holding Ian Neale grows giant vegetables. There are two children's homes, a small solar farm and a crematorium on the boundary with Langstone
The houses ribbon along a stretch of the Magor Road and along Pencoed Lane as far as the T junction where another area of green has been created. It then continues to Pencoed Castle Most properties are hidden from clear sight but they explode with colour and diversity beyond their front gates