Cities and Communities in Southern Ontario
(check also Northern Ontario)
| Aberfoyle | Alice | Angus | Arthur |
| Actinolite | Allan Park | Annan | Arva |
| Acton | Allanburg | Anstruther Lake | Ashburn |
| Adamsville | Allenford | Anten Mills | Ashgrove |
| Addison | Allenwood | Antrim | Ashton |
| Adelaide | Allenwood Beach | Appin | Astorville |
| Adolphustown | Alliston | Apple Hill | Athens |
| Ahmic Harbour | Alma | Appleton | Atherley |
| Ailsa Craig | Almonte | Apsley | Attercliffe |
| Ajax | Alpine Village | Apto | Atwood |
| Alban | Alton | Ardbeg | Auburn |
| Albemarie | Alvanley | Arden | Aurora |
| Alberton | Alvinston | Ardoch | Avening |
| Albury | Amberley | Ardtrea | Avon |
| Alcona | Ameliasburg | Argyle | Avonmore |
| Alderdale | Amherst Pointe | Ariss | Avonton |
| Aldershot | Amherstburg | Arkell | Aylmer |
| Alderville | Amherstview | Arkona | Ayr |
| Alexandria | Amurlee | Arkwright | Ayton |
| Alfred | Ancaster | Arnprior | |
| Algoma Mills | Andys Corners | Arnstein | |
| Algonquin |