| Oak Ridge to Olivares | 4,196.11 mi (6,752.99 km) |
| Oak Ridge to Olivenza | 4,112.95 mi (6,619.16 km) |
| Oak Ridge to Olot | 4,467.48 mi (7,189.72 km) |
| Oak Ridge to Onate | 4,216.70 mi (6,786.12 km) |
| Oak Ridge to Onda | 4,407.20 mi (7,092.70 km) |
| Oak Ridge to Onteniente | 4,425.76 mi (7,122.58 km) |
| Oak Ridge to Orihuela | 4,432.13 mi (7,132.83 km) |
| Oak Ridge to Osuna | 4,253.74 mi (6,845.74 km) |
| Oak Ridge to Ourense | 3,979.45 mi (6,404.31 km) |
| Oak Ridge to Oviedo | 4,048.69 mi (6,515.73 km) |
| Oak Ridge to Paiporta | 4,416.19 mi (7,107.17 km) |
| Oak Ridge to Pajara | 4,052.48 mi (6,521.83 km) |
| Oak Ridge to Palafolls | 4,495.46 mi (7,234.74 km) |
| Oak Ridge to Palafrugell | 4,506.60 mi (7,252.68 km) |
| Oak Ridge to Palamos | 4,507.29 mi (7,253.78 km) |
