| Sulphur to Orbetello | 5,504.59 mi (8,858.77 km) |
| Sulphur to Oria | 5,855.18 mi (9,423.00 km) |
| Sulphur to Oristano | 5,478.72 mi (8,817.14 km) |
| Sulphur to Orta Nova | 5,740.11 mi (9,237.81 km) |
| Sulphur to Orte | 5,554.48 mi (8,939.07 km) |
| Sulphur to Ortona | 5,644.70 mi (9,084.26 km) |
| Sulphur to Orvieto | 5,533.08 mi (8,904.64 km) |
| Sulphur to Orzinuovi | 5,344.31 mi (8,600.84 km) |
| Sulphur to Osimo | 5,562.88 mi (8,952.59 km) |
| Sulphur to Ospitaletto | 5,344.71 mi (8,601.47 km) |
| Sulphur to Ostuni | 5,843.61 mi (9,404.37 km) |
| Sulphur to Ottaviano | 5,705.75 mi (9,182.52 km) |
| Sulphur to Ovada | 5,316.36 mi (8,555.86 km) |
| Sulphur to Ozieri | 5,473.42 mi (8,808.61 km) |
| Sulphur to Paceco | 5,729.46 mi (9,220.67 km) |
