Caldicot is a market town and community in Monmouthshire, Wales. The town is located between Chepstow and the city of Newport. The site adjoins the Caldicot Levels, on the north side of the Severn Estuary. The population of the built-up area was 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.