Dundonald 's a town in County Down, Northern Ireland. It lies in the outer suburbs of east Belfast, within the district of Castlereagh. Dundonald's population stands at approximately 20,000, with the majority of residents coming from the unionist community. 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, Dún Dónaill, that sto… (More on Dundonald)