| Oconomowoc to Olivares | 4,180.20 mi (6,727.38 km) |
| Oconomowoc to Olivenza | 4,088.84 mi (6,580.35 km) |
| Oconomowoc to Olot | 4,372.72 mi (7,037.22 km) |
| Oconomowoc to Onate | 4,132.86 mi (6,651.20 km) |
| Oconomowoc to Onda | 4,343.36 mi (6,989.96 km) |
| Oconomowoc to Onteniente | 4,373.63 mi (7,038.68 km) |
| Oconomowoc to Orihuela | 4,388.06 mi (7,061.90 km) |
| Oconomowoc to Osuna | 4,235.12 mi (6,815.76 km) |
| Oconomowoc to Ourense | 3,922.29 mi (6,312.31 km) |
| Oconomowoc to Oviedo | 3,974.11 mi (6,395.71 km) |
| Oconomowoc to Paiporta | 4,357.82 mi (7,013.23 km) |
| Oconomowoc to Pajara | 4,157.85 mi (6,691.42 km) |
| Oconomowoc to Palafolls | 4,404.20 mi (7,087.87 km) |
| Oconomowoc to Palafrugell | 4,411.51 mi (7,099.64 km) |
| Oconomowoc to Palamos | 4,412.96 mi (7,101.98 km) |
