| Rio Grande City to Olivares | 5,271.90 mi (8,484.31 km) |
| Rio Grande City to Olivenza | 5,190.54 mi (8,353.37 km) |
| Rio Grande City to Olot | 5,549.48 mi (8,931.02 km) |
| Rio Grande City to Onate | 5,298.94 mi (8,527.82 km) |
| Rio Grande City to Onda | 5,488.97 mi (8,833.65 km) |
| Rio Grande City to Onteniente | 5,506.61 mi (8,862.03 km) |
| Rio Grande City to Orihuela | 5,512.07 mi (8,870.82 km) |
| Rio Grande City to Osuna | 5,329.92 mi (8,577.68 km) |
| Rio Grande City to Ourense | 5,061.16 mi (8,145.15 km) |
| Rio Grande City to Oviedo | 5,130.96 mi (8,257.48 km) |
| Rio Grande City to Paiporta | 5,497.59 mi (8,847.52 km) |
| Rio Grande City to Pajara | 5,080.37 mi (8,176.07 km) |
| Rio Grande City to Palafolls | 5,577.59 mi (8,976.27 km) |
| Rio Grande City to Palafrugell | 5,588.60 mi (8,993.98 km) |
| Rio Grande City to Palamos | 5,589.32 mi (8,995.14 km) |
