| Rio Grande City to Fortuna (California) | 1,748.25 mi (2,813.54 km) |
| Rio Grande City to Fortuna Foothills (Arizona) | 1,030.66 mi (1,658.69 km) |
| Rio Grande City to Foster City (California) | 1,569.72 mi (2,526.21 km) |
| Rio Grande City to Fostoria (Ohio) | 1,346.98 mi (2,167.76 km) |
| Rio Grande City to Fountain (Colorado) | 915.81 mi (1,473.85 km) |
| Rio Grande City to Fountain Hills (Arizona) | 919.05 mi (1,479.08 km) |
| Rio Grande City to Fountain Inn (South Carolina) | 1,141.62 mi (1,837.27 km) |
| Rio Grande City to Fountain Valley (California) | 1,248.55 mi (2,009.34 km) |
| Rio Grande City to Fountainebleau (Florida) | 1,146.39 mi (1,844.93 km) |
| Rio Grande City to Four Corners (Oregon) | 1,852.13 mi (2,980.71 km) |
| Rio Grande City to Four Corners (Texas) | 298.05 mi (479.66 km) |
| Rio Grande City to Four Square Mile (Colorado) | 983.18 mi (1,582.28 km) |
| Rio Grande City to Fox Crossing (Wisconsin) | 1,361.16 mi (2,190.58 km) |
| Rio Grande City to Fox Lake (Illinois) | 1,261.06 mi (2,029.49 km) |
| Rio Grande City to Framingham (Massachusetts) | 1,897.02 mi (3,052.96 km) |
