| Tomball to Orbetello | 5,608.37 mi (9,025.81 km) |
| Tomball to Oria | 5,957.22 mi (9,587.22 km) |
| Tomball to Oristano | 5,587.26 mi (8,991.83 km) |
| Tomball to Orta Nova | 5,842.43 mi (9,402.48 km) |
| Tomball to Orte | 5,657.52 mi (9,104.89 km) |
| Tomball to Ortona | 5,746.58 mi (9,248.23 km) |
| Tomball to Orvieto | 5,635.96 mi (9,070.19 km) |
| Tomball to Orzinuovi | 5,444.89 mi (8,762.70 km) |
| Tomball to Osimo | 5,663.88 mi (9,115.13 km) |
| Tomball to Ospitaletto | 5,444.99 mi (8,762.86 km) |
| Tomball to Ostuni | 5,945.39 mi (9,568.18 km) |
| Tomball to Ottaviano | 5,809.51 mi (9,349.50 km) |
| Tomball to Ovada | 5,418.74 mi (8,720.62 km) |
| Tomball to Ozieri | 5,580.88 mi (8,981.56 km) |
| Tomball to Paceco | 5,837.96 mi (9,395.28 km) |
