| Mason City to River Ridge (Louisiana) | 926.01 mi (1,490.27 km) |
| Mason City to Riverbank (California) | 1,498.76 mi (2,412.02 km) |
| Mason City to Riverdale (Georgia) | 814.65 mi (1,311.05 km) |
| Mason City to Riverdale (Illinois) | 302.22 mi (486.38 km) |
| Mason City to Riverside (California) | 1,447.04 mi (2,328.79 km) |
| Mason City to Riverside (Ohio) | 523.97 mi (843.26 km) |
| Mason City to Riverton (Utah) | 980.76 mi (1,578.37 km) |
| Mason City to Riverton (Wyoming) | 766.61 mi (1,233.74 km) |
| Mason City to Riverview (Florida) | 1,221.12 mi (1,965.20 km) |
| Mason City to Riverview (Michigan) | 512.50 mi (824.79 km) |
| Mason City to Riviera Beach (Florida) | 1,349.49 mi (2,171.79 km) |
| Mason City to Riviera Beach (Maryland) | 908.28 mi (1,461.73 km) |
| Mason City to Roanoke (Virginia) | 806.46 mi (1,297.87 km) |
| Mason City to Roanoke Rapids (North Carolina) | 944.40 mi (1,519.86 km) |
| Mason City to Robbinsdale (Minnesota) | 129.88 mi (209.03 km) |
