Thetford is a market town and civil parish in the Breckland district of Norfolk, England. It is on the A11 road between Norwich and London, just south of Thetford Forest. After World War II Thetford became an ‘overspill town’ taking people from London, as a result of which its population increased substantially. The civil parish, covering an area of 29.55 km (11.41 sq mi), has a population of 24,340.