GTA municipalities are:
- Town of Ajax
- Town of Aurora
- City of Brampton
- Township of Brock
- City of Burlington
- Town of Caledon
- Municipality of Clarington
- Durham Region
- Town of East Gwillimbury
- Town of Georgina
- Halton Region
- Town of Halton Hills
- Township of King
- City of Markham
- City of Mississauga
- Town of Milton
- Town of Newmarket
- Town of Oakville
- City of Oshawa
- Peel Region
- City of Pickering
- City of Richmond Hill
- Township of Scugog
- City of Toronto
- Township of Uxbridge
- York Region
- City of Vaughan
- Town of Whitchurch-Stouffville
- Town of Whitby
Note: The GTA is NOT a municipality, or political boundary, the GTA is a provincial planning or business area and the municipalities that are included in it can vary depending on who is using the term.
