| Grand Junction to Orbetello | 5,658.45 mi (9,106.39 km) |
| Grand Junction to Oria | 5,977.18 mi (9,619.34 km) |
| Grand Junction to Oristano | 5,691.48 mi (9,159.56 km) |
| Grand Junction to Orta Nova | 5,869.08 mi (9,445.38 km) |
| Grand Junction to Orte | 5,697.83 mi (9,169.77 km) |
| Grand Junction to Ortona | 5,771.70 mi (9,288.65 km) |
| Grand Junction to Orvieto | 5,675.20 mi (9,133.35 km) |
| Grand Junction to Orzinuovi | 5,466.14 mi (8,796.90 km) |
| Grand Junction to Osimo | 5,682.25 mi (9,144.70 km) |
| Grand Junction to Ospitaletto | 5,463.12 mi (8,792.04 km) |
| Grand Junction to Ostuni | 5,962.99 mi (9,596.50 km) |
| Grand Junction to Ottaviano | 5,852.69 mi (9,418.99 km) |
| Grand Junction to Ovada | 5,459.80 mi (8,786.71 km) |
| Grand Junction to Ozieri | 5,672.88 mi (9,129.62 km) |
| Grand Junction to Paceco | 5,933.62 mi (9,549.24 km) |
