- Nokia
- 600 March Rd , Ottawa
- Norton Rose Fulbright Offices
- 45 O'Connor Street, Suite 1500, Ottawa, ON
- Occo Kitchen
- 4240 Innes Rd, Orleans, ON
- OCISO
- 945 Wellington St, Ottawa, Ontario
- Old Firehall Community Centre
- 260 Sunnyside Ave, ottawa, ontario
- Old Ottawa South Community Centre
- 260 Sunnyside Avenue, Ottawa, ON
- One Resource
- 133 Besserer Street, Ottawa, Ontario, K1N 9J9
- Online
- Canada, Barrie, OH, T1Y 1S7, Ontario
- Ontario K1V 2N6
- EY Centre 4899 Uplands Drive Ottawa, Ontario K1V 2N6, Ottawa, Ontario, K1V 2N6
- Oreio
- 1315 Prince of Wales Dr, Ottawa, ON
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