| Smithville to Orbetello | 5,123.43 mi (8,245.37 km) |
| Smithville to Oria | 5,461.49 mi (8,789.42 km) |
| Smithville to Oristano | 5,127.50 mi (8,251.91 km) |
| Smithville to Orta Nova | 5,348.79 mi (8,608.04 km) |
| Smithville to Orte | 5,168.55 mi (8,317.98 km) |
| Smithville to Ortona | 5,251.56 mi (8,451.56 km) |
| Smithville to Orvieto | 5,146.36 mi (8,282.26 km) |
| Smithville to Orzinuovi | 4,945.92 mi (7,959.69 km) |
| Smithville to Osimo | 5,165.30 mi (8,312.74 km) |
| Smithville to Ospitaletto | 4,944.67 mi (7,957.67 km) |
| Smithville to Ostuni | 5,448.54 mi (8,768.59 km) |
| Smithville to Ottaviano | 5,322.96 mi (8,566.47 km) |
| Smithville to Ovada | 4,928.32 mi (7,931.36 km) |
| Smithville to Ozieri | 5,115.20 mi (8,232.13 km) |
| Smithville to Paceco | 5,375.94 mi (8,651.74 km) |
