Dundonald is a suburb of Belfast located in County Down, Northern Ireland. Most of the suburb is situated in a north- south running valley between the Castlereagh, and the Holywood hills. It is within the district of Castlereagh. Dundonald's population stands at approximately 20,000. Dundonald contains a large working-class housing estate, Ballybeen and many new housing developments have sprung up over the past 10 years. History Dundonald refers to a 12th century Norman fort, or Dún, D&… (More on Dundonald)