| Mason City to Blue Island (Illinois) | 299.74 mi (482.38 km) |
| Mason City to Blue Springs (Missouri) | 291.19 mi (468.62 km) |
| Mason City to Bluffdale (Utah) | 980.34 mi (1,577.71 km) |
| Mason City to Bluffton (Indiana) | 444.50 mi (715.36 km) |
| Mason City to Bluffton (South Carolina) | 1,008.18 mi (1,622.51 km) |
| Mason City to Blythe (California) | 1,328.16 mi (2,137.47 km) |
| Mason City to Blytheville (Arkansas) | 528.50 mi (850.53 km) |
| Mason City to Boca Raton (Florida) | 1,372.91 mi (2,209.48 km) |
| Mason City to Boerne (Texas) | 972.54 mi (1,565.16 km) |
| Mason City to Bogalusa (Louisiana) | 873.93 mi (1,406.46 km) |
| Mason City to Boiling Springs (South Carolina) | 820.56 mi (1,320.57 km) |
| Mason City to Boise (Idaho) | 1,153.39 mi (1,856.20 km) |
| Mason City to Bolingbrook (Illinois) | 278.80 mi (448.68 km) |
| Mason City to Bolivar (Missouri) | 383.14 mi (616.61 km) |
| Mason City to Bon Air (Virginia) | 908.50 mi (1,462.09 km) |
