| Marshfield to Orbetello | 4,714.90 mi (7,587.89 km) |
| Marshfield to Oria | 5,048.95 mi (8,125.50 km) |
| Marshfield to Oristano | 4,727.30 mi (7,607.85 km) |
| Marshfield to Orta Nova | 4,937.09 mi (7,945.48 km) |
| Marshfield to Orte | 4,758.66 mi (7,658.33 km) |
| Marshfield to Ortona | 4,839.66 mi (7,788.68 km) |
| Marshfield to Orvieto | 4,736.32 mi (7,622.37 km) |
| Marshfield to Orzinuovi | 4,533.53 mi (7,296.00 km) |
| Marshfield to Osimo | 4,752.55 mi (7,648.49 km) |
| Marshfield to Ospitaletto | 4,531.88 mi (7,293.35 km) |
| Marshfield to Ostuni | 5,035.72 mi (8,104.20 km) |
| Marshfield to Ottaviano | 4,913.44 mi (7,907.42 km) |
| Marshfield to Ovada | 4,518.55 mi (7,271.90 km) |
| Marshfield to Ozieri | 4,713.01 mi (7,584.85 km) |
| Marshfield to Paceco | 4,974.20 mi (8,005.20 km) |
