Regiony – Regions Region Durham – Regional Municipality of Durham Oshawa Pickering Durham Clarington Ajax Whitby Brock Scugog Uxbridge
Region Halton – Regional Municipality of Halton Burlington Halton Halton Hills Milton Oakville
Region Niagara – Regional Municipality of Niagara Niagara Falls Port Colborne St. Catharines Thorold Welland Niagara Fort Erie Grimsby Lincoln Niagara-on-the-Lake Pelham Wainfleet West Lincoln
Region Peel – Regional Municipality of Peel Brampton Mississauga Peel Caledon
Region Waterloo – Regional Municipality of Waterloo Cambridge Kitchener Waterloo North Dumfries Wellesley Wilmot Woolwich Waterloo
Region York – Regional Municipality of York Vaughan Aurora East Gwillimbury Georgina Markham Newmarket Richmond Hill Whitchurch-Stouffville King York
Alfabetyczna lista miast i jednostek samorządowych w Ontario A Ardarkland Acton Ailsa Craig Ajax Aldershot Alexandria Alfred Alliston Almonte Alvinston Amherstburg Amherstview Armstrong Arnprior Ancaster Angus Apsley Arthur Athens Atikokan Atwood Aurora Aylmer Ayr