| Fitchburg to Orbetello | 4,041.33 mi (6,503.89 km) |
| Fitchburg to Oria | 4,393.13 mi (7,070.07 km) |
| Fitchburg to Oristano | 4,015.09 mi (6,461.67 km) |
| Fitchburg to Orta Nova | 4,277.87 mi (6,884.56 km) |
| Fitchburg to Orte | 4,091.72 mi (6,584.99 km) |
| Fitchburg to Ortona | 4,182.90 mi (6,731.73 km) |
| Fitchburg to Orvieto | 4,070.46 mi (6,550.78 km) |
| Fitchburg to Orzinuovi | 3,884.18 mi (6,250.98 km) |
| Fitchburg to Osimo | 4,102.08 mi (6,601.67 km) |
| Fitchburg to Ospitaletto | 3,884.96 mi (6,252.24 km) |
| Fitchburg to Ostuni | 4,381.81 mi (7,051.84 km) |
| Fitchburg to Ottaviano | 4,242.47 mi (6,827.59 km) |
| Fitchburg to Ovada | 3,854.26 mi (6,202.84 km) |
| Fitchburg to Ozieri | 4,009.40 mi (6,452.51 km) |
| Fitchburg to Paceco | 4,265.83 mi (6,865.18 km) |
