| Round Rock to Noventa Vicentina | 5,575.65 mi (8,973.14 km) |
| Round Rock to Novi di Modena | 5,565.35 mi (8,956.56 km) |
| Round Rock to Novi Ligure | 5,483.98 mi (8,825.62 km) |
| Round Rock to Nuoro | 5,675.75 mi (9,134.24 km) |
| Round Rock to Occhiobello | 5,591.73 mi (8,999.03 km) |
| Round Rock to Oderzo | 5,594.20 mi (9,003.00 km) |
| Round Rock to Oggiono | 5,468.59 mi (8,800.85 km) |
| Round Rock to Olbia | 5,659.99 mi (9,108.87 km) |
| Round Rock to Oleggio | 5,446.37 mi (8,765.08 km) |
| Round Rock to Olgiate Comasco | 5,453.08 mi (8,775.88 km) |
| Round Rock to Olgiate Olona | 5,455.30 mi (8,779.46 km) |
| Round Rock to Omegna | 5,426.84 mi (8,733.66 km) |
| Round Rock to Opera | 5,478.23 mi (8,816.36 km) |
| Round Rock to Oppeano | 5,560.95 mi (8,949.49 km) |
| Round Rock to Orbassano | 5,423.18 mi (8,727.76 km) |
