Dereham, also known as East Dereham, is a town and civil parish in the English county of Norfolk. It is situated on the A47 road, some 15 miles (25 km) west of the city of Norwich and 25 miles (40 km) east of King's Lynn. The civil parish has an area of 21.51 km2 (8.31 sq mi) and in the 2001 census had a population of 15,659 in 6,941 households, the population at the 2011 Census increasing to 18,609.