| Webster Groves to Noventa Vicentina | 4,887.46 mi (7,865.61 km) |
| Webster Groves to Novi di Modena | 4,878.17 mi (7,850.66 km) |
| Webster Groves to Novi Ligure | 4,798.65 mi (7,722.68 km) |
| Webster Groves to Nuoro | 4,998.72 mi (8,044.66 km) |
| Webster Groves to Occhiobello | 4,904.02 mi (7,892.26 km) |
| Webster Groves to Oderzo | 4,904.75 mi (7,893.43 km) |
| Webster Groves to Oggiono | 4,781.20 mi (7,694.59 km) |
| Webster Groves to Olbia | 4,981.42 mi (8,016.82 km) |
| Webster Groves to Oleggio | 4,759.77 mi (7,660.11 km) |
| Webster Groves to Olgiate Comasco | 4,765.96 mi (7,670.06 km) |
| Webster Groves to Olgiate Olona | 4,768.47 mi (7,674.11 km) |
| Webster Groves to Omegna | 4,739.97 mi (7,628.24 km) |
| Webster Groves to Opera | 4,791.55 mi (7,711.25 km) |
| Webster Groves to Oppeano | 4,872.99 mi (7,842.31 km) |
| Webster Groves to Orbassano | 4,738.42 mi (7,625.76 km) |
