| Norristown to Olivares | 3,634.56 mi (5,849.27 km) |
| Norristown to Olivenza | 3,550.36 mi (5,713.75 km) |
| Norristown to Olot | 3,902.58 mi (6,280.59 km) |
| Norristown to Onate | 3,651.57 mi (5,876.64 km) |
| Norristown to Onda | 3,842.17 mi (6,183.37 km) |
| Norristown to Onteniente | 3,861.22 mi (6,214.03 km) |
| Norristown to Orihuela | 3,868.09 mi (6,225.09 km) |
| Norristown to Osuna | 3,691.94 mi (5,941.61 km) |
| Norristown to Ourense | 3,414.47 mi (5,495.06 km) |
| Norristown to Oviedo | 3,483.48 mi (5,606.11 km) |
| Norristown to Paiporta | 3,851.35 mi (6,198.15 km) |
| Norristown to Pajara | 3,521.32 mi (5,667.02 km) |
| Norristown to Palafolls | 3,930.43 mi (6,325.41 km) |
| Norristown to Palafrugell | 3,941.69 mi (6,343.54 km) |
| Norristown to Palamos | 3,942.35 mi (6,344.60 km) |
