| Macomb to Orbetello | 4,919.33 mi (7,916.90 km) |
| Macomb to Oria | 5,259.90 mi (8,464.99 km) |
| Macomb to Oristano | 4,919.03 mi (7,916.42 km) |
| Macomb to Orta Nova | 5,146.65 mi (8,282.73 km) |
| Macomb to Orte | 4,965.29 mi (7,990.86 km) |
| Macomb to Ortona | 5,049.62 mi (8,126.58 km) |
| Macomb to Orvieto | 4,943.20 mi (7,955.31 km) |
| Macomb to Orzinuovi | 4,744.54 mi (7,635.60 km) |
| Macomb to Osimo | 4,964.04 mi (7,988.85 km) |
| Macomb to Ospitaletto | 4,743.58 mi (7,634.05 km) |
| Macomb to Ostuni | 5,247.18 mi (8,444.52 km) |
| Macomb to Ottaviano | 5,119.36 mi (8,238.81 km) |
| Macomb to Ovada | 4,725.11 mi (7,604.34 km) |
| Macomb to Ozieri | 4,907.67 mi (7,898.13 km) |
| Macomb to Paceco | 5,168.05 mi (8,317.18 km) |
