| Merthyr Tudful to Myrtle Grove (North Carolina) | 3,781.46 mi (6,085.67 km) |
| Merthyr Tudful to Nacogdoches (Texas) | 4,589.82 mi (7,386.60 km) |
| Merthyr Tudful to Nampa (Idaho) | 4,740.23 mi (7,628.66 km) |
| Merthyr Tudful to Nanakuli (Hawaii) | 7,158.10 mi (11,519.84 km) |
| Merthyr Tudful to Nanticoke (Pennsylvania) | 3,383.88 mi (5,445.84 km) |
| Merthyr Tudful to Nanuet (New York) | 3,307.25 mi (5,322.50 km) |
| Merthyr Tudful to Napa (California) | 5,211.43 mi (8,386.98 km) |
| Merthyr Tudful to Naperville (Illinois) | 3,842.28 mi (6,183.54 km) |
| Merthyr Tudful to Naples (Florida) | 4,336.42 mi (6,978.79 km) |
| Merthyr Tudful to Naranja (Florida) | 4,310.33 mi (6,936.81 km) |
| Merthyr Tudful to Nashua (New Hampshire) | 3,134.84 mi (5,045.04 km) |
| Merthyr Tudful to Nashville (Tennessee) | 4,049.61 mi (6,517.22 km) |
| Merthyr Tudful to Natchez (Mississippi) | 4,462.55 mi (7,181.79 km) |
| Merthyr Tudful to Natchitoches (Louisiana) | 4,521.81 mi (7,277.15 km) |
| Merthyr Tudful to National City (California) | 5,364.08 mi (8,632.66 km) |
