| Mattoon to Orbetello | 4,869.11 mi (7,836.07 km) |
| Mattoon to Oria | 5,213.34 mi (8,390.06 km) |
| Mattoon to Oristano | 4,861.11 mi (7,823.20 km) |
| Mattoon to Orta Nova | 5,099.36 mi (8,206.62 km) |
| Mattoon to Orte | 4,916.38 mi (7,912.15 km) |
| Mattoon to Ortona | 5,002.74 mi (8,051.13 km) |
| Mattoon to Orvieto | 4,894.49 mi (7,876.91 km) |
| Mattoon to Orzinuovi | 4,698.84 mi (7,562.05 km) |
| Mattoon to Osimo | 4,918.30 mi (7,915.24 km) |
| Mattoon to Ospitaletto | 4,698.34 mi (7,561.24 km) |
| Mattoon to Ostuni | 5,200.99 mi (8,370.18 km) |
| Mattoon to Ottaviano | 5,069.76 mi (8,158.99 km) |
| Mattoon to Ovada | 4,676.56 mi (7,526.19 km) |
| Mattoon to Ozieri | 4,851.49 mi (7,807.71 km) |
| Mattoon to Paceco | 5,110.98 mi (8,225.33 km) |
