| Trinity to Orbetello | 5,116.47 mi (8,234.17 km) |
| Trinity to Oria | 5,473.89 mi (8,809.38 km) |
| Trinity to Oristano | 5,061.00 mi (8,144.89 km) |
| Trinity to Orta Nova | 5,358.39 mi (8,623.50 km) |
| Trinity to Orte | 5,170.46 mi (8,321.05 km) |
| Trinity to Ortona | 5,266.71 mi (8,475.95 km) |
| Trinity to Orvieto | 5,150.32 mi (8,288.63 km) |
| Trinity to Orzinuovi | 4,977.81 mi (8,011.01 km) |
| Trinity to Osimo | 5,191.27 mi (8,354.54 km) |
| Trinity to Ospitaletto | 4,980.02 mi (8,014.57 km) |
| Trinity to Ostuni | 5,464.01 mi (8,793.48 km) |
| Trinity to Ottaviano | 5,315.64 mi (8,554.69 km) |
| Trinity to Ovada | 4,939.16 mi (7,948.81 km) |
| Trinity to Ozieri | 5,062.60 mi (8,147.47 km) |
| Trinity to Paceco | 5,309.52 mi (8,544.85 km) |
