Alnwick was a local government district of Northumberland, England. Its council was based in the town of Alnwick and the district had a population of 31,029 according to the 2001 census. It was one of the most rural and sparsely populated districts in the United Kingdom, having a resident population of 32,300 in an area of 1,079.51 square kilometres, according to the 2001 census.