| Rio Grande City to Ukiah (California) | 1,660.79 mi (2,672.79 km) |
| Rio Grande City to Union (Missouri) | 949.19 mi (1,527.58 km) |
| Rio Grande City to Union City (California) | 1,558.50 mi (2,508.16 km) |
| Rio Grande City to Union City (Georgia) | 986.73 mi (1,587.99 km) |
| Rio Grande City to Union City (New Jersey) | 1,729.07 mi (2,782.67 km) |
| Rio Grande City to Union City (Tennessee) | 901.11 mi (1,450.19 km) |
| Rio Grande City to Union Hill-Novelty Hill (Washington) | 1,935.01 mi (3,114.10 km) |
| Rio Grande City to Union Park (Florida) | 1,087.55 mi (1,750.24 km) |
| Rio Grande City to Uniondale (New York) | 1,747.91 mi (2,812.99 km) |
| Rio Grande City to Universal City (Texas) | 221.35 mi (356.23 km) |
| Rio Grande City to University (Florida) | 1,012.84 mi (1,630.01 km) |
| Rio Grande City to University City (Missouri) | 981.27 mi (1,579.20 km) |
| Rio Grande City to University Heights (Ohio) | 1,434.08 mi (2,307.93 km) |
| Rio Grande City to University of California-Santa Barbara (California) | 1,367.43 mi (2,200.66 km) |
| Rio Grande City to University Park (Texas) | 463.28 mi (745.58 km) |
