| Boulder City to Olivares | 5,628.17 mi (9,057.66 km) |
| Boulder City to Olivenza | 5,532.93 mi (8,904.39 km) |
| Boulder City to Olot | 5,755.75 mi (9,262.98 km) |
| Boulder City to Onate | 5,531.13 mi (8,901.49 km) |
| Boulder City to Onda | 5,754.87 mi (9,261.57 km) |
| Boulder City to Onteniente | 5,794.05 mi (9,324.62 km) |
| Boulder City to Orihuela | 5,814.40 mi (9,357.37 km) |
| Boulder City to Osuna | 5,680.80 mi (9,142.36 km) |
| Boulder City to Ourense | 5,346.28 mi (8,604.00 km) |
| Boulder City to Oviedo | 5,383.47 mi (8,663.86 km) |
| Boulder City to Paiporta | 5,773.54 mi (9,291.62 km) |
| Boulder City to Pajara | 5,646.16 mi (9,086.61 km) |
| Boulder City to Palafolls | 5,789.95 mi (9,318.03 km) |
| Boulder City to Palafrugell | 5,793.38 mi (9,323.54 km) |
| Boulder City to Palamos | 5,795.55 mi (9,327.04 km) |
