A
- Aberarder
- Abercorn
- Aberfeldy
- Aberfoyle
- Aberfoyle Creek Estates
- Abingdon
- Abney
- Aboushagan Road
- Abrams Village
- Achill
- Actinolite
- Actons Corners
- Acton Vale
- Adams Lake
- Adamsville
- Adamsville
- Adderley
- Addison
- Adelaide
- Adelaide Metcalfe
- Adjala-Tosorontio
- Adolphustown
- Adstock
- Afton
- Afton Road
- Agency Indian Reserve No. 30
- Ahmic Harbour
- Ahmic Lake
- Aikensville
- Ailsa Craig
- Airlie
- Akwesasne
- Akwesasne 59
- Alaska
- Albany
- Albany Corner
- Albas
- Alberry Plains
- Albert
- Alberta Beach
- Albert Beach
- Alberton
- Alberton South
- Albion
- Albion Cross
- Albuna
- Albury
- Alcona
- Alder Point
- Alderslea
- Alexander
- Alexandra
- Alexandria
- Algonquin
- Algonquin Highlands
- Allanburg
- Allan Park
- Allegra
- Allenford
- Allens Corners
- Allensville
- Allenwood
- Allenwood Beach
- Alliance
- Allimil
- Allimill
- Allisary
- Allisonville
- Alliston
- Alliston
- Allsaw
- Alma
- Alma
- Almdals Cove
- Alpine Ridge
- Alpine Village
- Alport
- Alsace
- Alsfeldt
- Alvanley
- Alvinston
- Ambassador Beach
- Amberley
- Ambleside
- Ameliasburg
- Amherst
- Amherstburg
- Amherst Pointe
- Amherstview
- Amiens
- Amigari Downs
- Amigo Beach
- Amik/Talisman
- Amulree
- Ancona Point
- Andy's Corners
- Anglemont
- Anglo Rustico
- Anglo Tignish
- Angus
- Annable Settlement
- Annan
- Annandale
- Annapolis Royal
- Anoma Lea
- Anstruther Lake
- Anten Mills
- Antioch
- Appin
- Appin Road
- Appledore
- Apple Hill
- Apsley
- Apto
- Arborg
- Arbor-Vitae
- Archer
- Ardbeg
- Ardmore Beach
- Ardtrea
- Argentia Beach
- Argyle
- Argyle Shore
- Arichat
- Ariss
- Arkell
- Arkona
- Arkwood
- Arkwright
- Arlington
- Arlington
- Armour
- Armow
- Armstrong
- Armstrong
- Armstrong Mills
- Arner
- Arnstein
- Arran-Elderslie
- Arranvale
- Arthur
- Arthur's Corners
- Arundel
- Arva
- Ascension
- Ascot
- Ascot Corner
- Ashby Mill
- Ashern
- Ashfield
- Ashfield-Colborne-Wawanosh
- Ashworth
- Askilton
- Aspdin
- Asphodel-Norwood
- Assabaska Indian Reserve
- Asselstine
- Assumption
- Athens
- Atherley
- Atherton
- Athlone
- Athol
- Attercliffe
- Attercliffe Station
- Atwood
- Auburn
- Auburn
- Auden Park
- Audet
- Aughrim
- Augusta
- Austin
- Avalon Park
- Avening
- Avery Point
- Avon
- Avonbank
- Avondale
- Avondale
- Avonmore
- Avonry
- Avonton
- Axe Lake
- Ayer's Cliff
- Aylesworth
- Aylmer
- Ayr
- Ayton
