| Mason City to Ridgeland (Mississippi) | 759.38 mi (1,222.11 km) |
| Mason City to Ridgewood (New Jersey) | 988.20 mi (1,590.35 km) |
| Mason City to Rifle (Colorado) | 794.86 mi (1,279.20 km) |
| Mason City to Rincon (Georgia) | 992.88 mi (1,597.88 km) |
| Mason City to Ringwood (New Jersey) | 977.83 mi (1,573.67 km) |
| Mason City to Río Grande (Puerto Rico) | 2,338.49 mi (3,763.44 km) |
| Mason City to Rio Grande City (Texas) | 1,200.94 mi (1,932.72 km) |
| Mason City to Rio Linda (California) | 1,498.85 mi (2,412.17 km) |
| Mason City to Rio Rancho (New Mexico) | 902.06 mi (1,451.73 km) |
| Mason City to Rio Rico (Arizona) | 1,261.63 mi (2,030.39 km) |
| Mason City to Ripon (California) | 1,507.76 mi (2,426.50 km) |
| Mason City to River Edge (New Jersey) | 992.92 mi (1,597.95 km) |
| Mason City to River Falls (Wisconsin) | 121.70 mi (195.86 km) |
| Mason City to River Forest (Illinois) | 287.29 mi (462.34 km) |
| Mason City to River Grove (Illinois) | 285.72 mi (459.83 km) |
