| Rio Grande City to Opwijk | 5,347.63 mi (8,606.18 km) |
| Rio Grande City to Ostend | 5,290.51 mi (8,514.25 km) |
| Rio Grande City to Oud-Heverlee | 5,370.59 mi (8,643.13 km) |
| Rio Grande City to Oud-Turnhout | 5,367.67 mi (8,638.43 km) |
| Rio Grande City to Oudenaarde | 5,328.44 mi (8,575.30 km) |
| Rio Grande City to Oudenburg | 5,294.92 mi (8,521.35 km) |
| Rio Grande City to Oupeye | 5,412.47 mi (8,710.52 km) |
| Rio Grande City to Overijse | 5,366.96 mi (8,637.29 km) |
| Rio Grande City to Overpelt | 5,387.49 mi (8,670.33 km) |
| Rio Grande City to Paal | 5,383.73 mi (8,664.27 km) |
| Rio Grande City to Peer | 5,391.58 mi (8,676.91 km) |
| Rio Grande City to Pepinster | 5,423.75 mi (8,728.69 km) |
| Rio Grande City to Peruwelz | 5,337.96 mi (8,590.61 km) |
| Rio Grande City to Perwez | 5,382.93 mi (8,662.99 km) |
| Rio Grande City to Philippeville | 5,385.86 mi (8,667.70 km) |
