| Ontario to Opwijk | 5,582.69 mi (8,984.48 km) |
| Ontario to Ostend | 5,530.82 mi (8,900.99 km) |
| Ontario to Oud-Heverlee | 5,604.16 mi (9,019.02 km) |
| Ontario to Oud-Turnhout | 5,590.30 mi (8,996.73 km) |
| Ontario to Oudenaarde | 5,570.13 mi (8,964.26 km) |
| Ontario to Oudenburg | 5,535.37 mi (8,908.31 km) |
| Ontario to Oupeye | 5,640.35 mi (9,077.27 km) |
| Ontario to Overijse | 5,602.46 mi (9,016.28 km) |
| Ontario to Overpelt | 5,608.41 mi (9,025.87 km) |
| Ontario to Paal | 5,609.68 mi (9,027.90 km) |
| Ontario to Peer | 5,613.66 mi (9,034.32 km) |
| Ontario to Pepinster | 5,652.67 mi (9,097.09 km) |
| Ontario to Peruwelz | 5,585.63 mi (8,989.20 km) |
| Ontario to Perwez | 5,618.95 mi (9,042.83 km) |
| Ontario to Philippeville | 5,631.37 mi (9,062.81 km) |
