| Diamond Bar to Noventa Vicentina | 6,109.52 mi (9,832.32 km) |
| Diamond Bar to Novi di Modena | 6,110.25 mi (9,833.50 km) |
| Diamond Bar to Novi Ligure | 6,049.17 mi (9,735.20 km) |
| Diamond Bar to Nuoro | 6,297.35 mi (10,134.61 km) |
| Diamond Bar to Occhiobello | 6,130.20 mi (9,865.60 km) |
| Diamond Bar to Oderzo | 6,112.60 mi (9,837.27 km) |
| Diamond Bar to Oggiono | 6,014.47 mi (9,679.35 km) |
| Diamond Bar to Olbia | 6,271.99 mi (10,093.79 km) |
| Diamond Bar to Oleggio | 6,000.94 mi (9,657.58 km) |
| Diamond Bar to Olgiate Comasco | 6,002.22 mi (9,659.64 km) |
| Diamond Bar to Olgiate Olona | 6,007.28 mi (9,667.78 km) |
| Diamond Bar to Omegna | 5,979.35 mi (9,622.84 km) |
| Diamond Bar to Opera | 6,030.92 mi (9,705.82 km) |
| Diamond Bar to Oppeano | 6,097.70 mi (9,813.29 km) |
| Diamond Bar to Orbassano | 5,995.41 mi (9,648.68 km) |
