| Mason City to Jacksonville (North Carolina) | 1,026.79 mi (1,652.46 km) |
| Mason City to Jacksonville (Texas) | 780.91 mi (1,256.76 km) |
| Mason City to Jacksonville Beach (Florida) | 1,101.03 mi (1,771.93 km) |
| Mason City to James Island (South Carolina) | 1,017.25 mi (1,637.10 km) |
| Mason City to Jamestown (New York) | 712.75 mi (1,147.06 km) |
| Mason City to Jamestown (North Dakota) | 373.17 mi (600.55 km) |
| Mason City to Janesville (Wisconsin) | 214.20 mi (344.73 km) |
| Mason City to Jasmine Estates (Florida) | 1,181.42 mi (1,901.31 km) |
| Mason City to Jasper (Alabama) | 717.49 mi (1,154.69 km) |
| Mason City to Jasper (Indiana) | 463.67 mi (746.21 km) |
| Mason City to Jefferson (Georgia) | 808.74 mi (1,301.55 km) |
| Mason City to Jefferson (Louisiana) | 926.54 mi (1,491.12 km) |
| Mason City to Jefferson City (Missouri) | 321.01 mi (516.61 km) |
| Mason City to Jefferson Hills (Pennsylvania) | 711.19 mi (1,144.55 km) |
| Mason City to Jefferson Valley-Yorktown (New York) | 998.15 mi (1,606.36 km) |
