| Rockwall to Orbetello | 5,506.46 mi (8,861.80 km) |
| Rockwall to Oria | 5,851.40 mi (9,416.92 km) |
| Rockwall to Oristano | 5,495.32 mi (8,843.86 km) |
| Rockwall to Orta Nova | 5,737.31 mi (9,233.31 km) |
| Rockwall to Orte | 5,554.05 mi (8,938.38 km) |
| Rockwall to Ortona | 5,640.77 mi (9,077.94 km) |
| Rockwall to Orvieto | 5,532.20 mi (8,903.21 km) |
| Rockwall to Orzinuovi | 5,337.04 mi (8,589.14 km) |
| Rockwall to Osimo | 5,556.49 mi (8,942.30 km) |
| Rockwall to Ospitaletto | 5,336.59 mi (8,588.41 km) |
| Rockwall to Ostuni | 5,839.10 mi (9,397.12 km) |
| Rockwall to Ottaviano | 5,707.24 mi (9,184.91 km) |
| Rockwall to Ovada | 5,314.34 mi (8,552.60 km) |
| Rockwall to Ozieri | 5,486.61 mi (8,829.85 km) |
| Rockwall to Paceco | 5,745.54 mi (9,246.55 km) |
