| South Houston to Noventa Vicentina | 5,520.72 mi (8,884.74 km) |
| South Houston to Novi di Modena | 5,508.94 mi (8,865.78 km) |
| South Houston to Novi Ligure | 5,425.19 mi (8,730.99 km) |
| South Houston to Nuoro | 5,607.92 mi (9,025.07 km) |
| South Houston to Occhiobello | 5,536.07 mi (8,909.44 km) |
| South Houston to Oderzo | 5,541.34 mi (8,917.92 km) |
| South Houston to Oggiono | 5,412.61 mi (8,710.75 km) |
| South Houston to Olbia | 5,593.59 mi (9,002.01 km) |
| South Houston to Oleggio | 5,389.29 mi (8,673.22 km) |
| South Houston to Olgiate Comasco | 5,396.73 mi (8,685.20 km) |
| South Houston to Olgiate Olona | 5,398.54 mi (8,688.10 km) |
| South Houston to Omegna | 5,370.17 mi (8,642.45 km) |
| South Houston to Opera | 5,421.23 mi (8,724.63 km) |
| South Houston to Oppeano | 5,505.71 mi (8,860.59 km) |
| South Houston to Orbassano | 5,363.74 mi (8,632.10 km) |
