| Boulder to Noventa Vicentina | 5,363.86 mi (8,632.31 km) |
| Boulder to Novi di Modena | 5,361.41 mi (8,628.35 km) |
| Boulder to Novi Ligure | 5,294.18 mi (8,520.16 km) |
| Boulder to Nuoro | 5,529.35 mi (8,898.62 km) |
| Boulder to Occhiobello | 5,383.36 mi (8,663.68 km) |
| Boulder to Oderzo | 5,371.56 mi (8,644.69 km) |
| Boulder to Oggiono | 5,264.62 mi (8,472.59 km) |
| Boulder to Olbia | 5,506.21 mi (8,861.38 km) |
| Boulder to Oleggio | 5,248.54 mi (8,446.71 km) |
| Boulder to Olgiate Comasco | 5,251.36 mi (8,451.24 km) |
| Boulder to Olgiate Olona | 5,255.65 mi (8,458.16 km) |
| Boulder to Omegna | 5,227.37 mi (8,412.64 km) |
| Boulder to Opera | 5,279.27 mi (8,496.16 km) |
| Boulder to Oppeano | 5,351.11 mi (8,611.78 km) |
| Boulder to Orbassano | 5,238.12 mi (8,429.94 km) |
