Caldicot is a market town and community in Monmouthshire, southeast Wales, located between Chepstow and Newport on the Gloucester–Newport line served primarily by Caldicot station, whilst by road it is just off the busy M4 / M48 motorway corridor. The site adjoins the Caldicot Levels, on the north side of the Severn Estuary. Caldicot has easy access on the railway west to Newport, Cardiff Central and east to Chepstow, Lydney, and Gloucester, as well as one stop west to Severn Tunnel Junction and then east via the Severn Tunnel to Filton Abbeywood and Bristol Temple Meads and further afield. Generally good road access to Cardiff and across the Second Severn Crossing, old Severn Bridge to Bristol. The population of the town is around 11,000. It has a large school, Caldicot School, and is known for its medieval castle. The built-up area includes Portskewett. Caldicot had a population of 9,604 in 2011.