| Costco AJAX | Ajax(905) 619-6677 | (905) 619-6677 |
| Costco Ancaster | Ancaster(905) 304-0344 | (905) 304-0344 |
| Costco BARRIE | Barrie(705) 728-2350 | (705) 728-2350 |
| Costco Brampton | Brampton(905) 450-9300 | (905) 450-9300 |
| Costco BURLINGTON ON | Burlington(905) 336-6714 | (905) 336-6714 |
| Costco NEWMARKET | East Gwillimbury(905) 954-4733 | (905) 954-4733 |
| Costco Etobicoke | Etobicoke(416) 251-2832 | (416) 251-2832 |
| Costco GLOUCESTER | Gloucester(613) 748-9966 | (613) 748-9966 |
| Costco Guelph | Guelph(519) 780-5700 | (519) 780-5700 |
| Costco Kanata | Kanata(613) 270-5550 | (613) 270-5550 |
| Costco Kingston | Kingston(613) 549-2527 | (613) 549-2527 |
| Costco KITCHENER | Kitchener(519) 650-3330 | (519) 650-3330 |
| Costco WESTMINSTER ON | London(519) 680-1027 | (519) 680-1027 |
| Costco N LONDON | London(519) 474-5301 | (519) 474-5301 |
| Costco MARKHAM | Markham(905) 477-5718 | (905) 477-5718 |
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| Costco E MARKHAM | Markham(905) 201-3502 | (905) 201-3502 |
| Costco C Mississauga | Mississauga(905) 566-2400 | (905) 566-2400 |
| Costco N Mississauga | Mississauga(905) 568-4828 | (905) 568-4828 |
| Costco S Mississauga | Mississauga(905) 828-3340 | (905) 828-3340 |
| Costco NEPEAN | Nepean(613) 727-4786 | (613) 727-4786 |
| Costco Downsview | North York(416) 635-8175 | (416) 635-8175 |
| Costco Oshawa | Oshawa(905) 404-4050 | (905) 404-4050 |
| Costco Peterborough | Peterborough(705) 750-2600 | (705) 750-2600 |
| Costco Richmond Hill | Richmond Hill(905) 780-2100 | (905) 780-2100 |
| Costco Scarborough | Scarborough(416) 288-0033 | (416) 288-0033 |
| Costco ST CATHARINES | St Catharines(905) 646-2008 | (905) 646-2008 |
| Costco Sudbury | Sudbury(705) 524-8255 | (705) 524-8255 |
| Costco WINDSOR | Windsor(519) 972-1899 | (519) 972-1899 |
| Costco Vaughan | Woodbridge(905) 264-8337 | (905) 264-8337 |
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