The most ethnically diverse ward of the city was the (now defunct) The Thornholme ward no longer existed in the is made up of 99.3% white, 0.4% Asian and 0.2% mixed-race.
The most ethnically diverse ward of the city was the (now defunct) The Thornholme ward no longer existed in the United Kingdom Census 2011 Thornholme area which had a population of 10,214 in 2001. The area of Castletown is made up of 99.3% white, 0.4% Asian and 0.2% mixed-race.