| Oro Valley to Noventa Vicentina | 5,973.73 mi (9,613.78 km) |
| Oro Valley to Novi di Modena | 5,970.46 mi (9,608.53 km) |
| Oro Valley to Novi Ligure | 5,901.50 mi (9,497.54 km) |
| Oro Valley to Nuoro | 6,131.07 mi (9,867.01 km) |
| Oro Valley to Occhiobello | 5,992.92 mi (9,644.67 km) |
| Oro Valley to Oderzo | 5,982.44 mi (9,627.81 km) |
| Oro Valley to Oggiono | 5,873.51 mi (9,452.50 km) |
| Oro Valley to Olbia | 6,109.04 mi (9,831.55 km) |
| Oro Valley to Oleggio | 5,856.71 mi (9,425.47 km) |
| Oro Valley to Olgiate Comasco | 5,859.97 mi (9,430.71 km) |
| Oro Valley to Olgiate Olona | 5,864.05 mi (9,437.27 km) |
| Oro Valley to Omegna | 5,835.69 mi (9,391.63 km) |
| Oro Valley to Opera | 5,887.63 mi (9,475.22 km) |
| Oro Valley to Oppeano | 5,960.76 mi (9,592.92 km) |
| Oro Valley to Orbassano | 5,844.73 mi (9,406.18 km) |
