| Rio Grande City to Oak Grove (South Carolina) | 1,176.62 mi (1,893.59 km) |
| Rio Grande City to Oak Harbor (Washington) | 1,984.17 mi (3,193.21 km) |
| Rio Grande City to Oak Hills (Oregon) | 1,871.91 mi (3,012.55 km) |
| Rio Grande City to Oak Lawn (Illinois) | 1,231.99 mi (1,982.70 km) |
| Rio Grande City to Oak Park (California) | 1,303.40 mi (2,097.62 km) |
| Rio Grande City to Oak Park (Illinois) | 1,240.85 mi (1,996.96 km) |
| Rio Grande City to Oak Park (Michigan) | 1,419.60 mi (2,284.63 km) |
| Rio Grande City to Oak Ridge (Florida) | 1,076.14 mi (1,731.88 km) |
| Rio Grande City to Oak Ridge (New Jersey) | 1,716.21 mi (2,761.97 km) |
| Rio Grande City to Oak Ridge (Tennessee) | 1,082.28 mi (1,741.77 km) |
| Rio Grande City to Oakdale (California) | 1,504.50 mi (2,421.26 km) |
| Rio Grande City to Oakdale (Minnesota) | 1,326.04 mi (2,134.05 km) |
| Rio Grande City to Oakland (California) | 1,573.56 mi (2,532.41 km) |
| Rio Grande City to Oakland (New Jersey) | 1,727.93 mi (2,780.84 km) |
| Rio Grande City to Oakland Park (Florida) | 1,155.64 mi (1,859.82 km) |
