| Rio Grande City to Portage (Indiana) | 1,241.71 mi (1,998.34 km) |
| Rio Grande City to Portage (Michigan) | 1,324.98 mi (2,132.35 km) |
| Rio Grande City to Portage (Wisconsin) | 1,297.03 mi (2,087.37 km) |
| Rio Grande City to Portales (New Mexico) | 602.52 mi (969.65 km) |
| Rio Grande City to Porterville (California) | 1,364.82 mi (2,196.47 km) |
| Rio Grande City to Portland (Maine) | 1,992.47 mi (3,206.58 km) |
| Rio Grande City to Portland (Oregon) | 1,864.37 mi (3,000.42 km) |
| Rio Grande City to Portland (Tennessee) | 1,009.59 mi (1,624.78 km) |
| Rio Grande City to Portland (Texas) | 139.17 mi (223.97 km) |
| Rio Grande City to Portsmouth (New Hampshire) | 1,950.06 mi (3,138.32 km) |
| Rio Grande City to Portsmouth (Ohio) | 1,255.60 mi (2,020.70 km) |
| Rio Grande City to Portsmouth (Virginia) | 1,501.31 mi (2,416.12 km) |
| Rio Grande City to Post Falls (Idaho) | 1,771.32 mi (2,850.67 km) |
| Rio Grande City to Potomac (Maryland) | 1,524.24 mi (2,453.03 km) |
| Rio Grande City to Potomac Park (California) | 1,342.48 mi (2,160.52 km) |
