| Elk River to Orbetello | 4,813.14 mi (7,746.00 km) |
| Elk River to Oria | 5,142.01 mi (8,275.27 km) |
| Elk River to Oristano | 4,833.82 mi (7,779.28 km) |
| Elk River to Orta Nova | 5,031.34 mi (8,097.17 km) |
| Elk River to Orte | 4,855.31 mi (7,813.87 km) |
| Elk River to Ortona | 4,933.80 mi (7,940.19 km) |
| Elk River to Orvieto | 4,832.84 mi (7,777.70 km) |
| Elk River to Orzinuovi | 4,627.46 mi (7,447.18 km) |
| Elk River to Osimo | 4,845.73 mi (7,798.45 km) |
| Elk River to Ospitaletto | 4,625.31 mi (7,443.72 km) |
| Elk River to Ostuni | 5,128.42 mi (8,253.40 km) |
| Elk River to Ottaviano | 5,010.31 mi (8,063.32 km) |
| Elk River to Ovada | 4,615.68 mi (7,428.22 km) |
| Elk River to Ozieri | 4,817.71 mi (7,753.36 km) |
| Elk River to Paceco | 5,078.97 mi (8,173.81 km) |
