| Merthyr Tudful to Kenosha (Wisconsin) | 3,792.89 mi (6,104.06 km) |
| Merthyr Tudful to Kent (Ohio) | 3,602.30 mi (5,797.35 km) |
| Merthyr Tudful to Kent (Washington) | 4,693.54 mi (7,553.52 km) |
| Merthyr Tudful to Kentwood (Michigan) | 3,691.48 mi (5,940.86 km) |
| Merthyr Tudful to Kerman (California) | 5,231.67 mi (8,419.56 km) |
| Merthyr Tudful to Kernersville (North Carolina) | 3,779.85 mi (6,083.09 km) |
| Merthyr Tudful to Kerrville (Texas) | 4,847.76 mi (7,801.72 km) |
| Merthyr Tudful to Kettering (Maryland) | 3,517.31 mi (5,660.57 km) |
| Merthyr Tudful to Kettering (Ohio) | 3,778.96 mi (6,081.66 km) |
| Merthyr Tudful to Kewanee (Illinois) | 3,933.43 mi (6,330.25 km) |
| Merthyr Tudful to Key Biscayne (Florida) | 4,290.61 mi (6,905.06 km) |
| Merthyr Tudful to Key Largo (Florida) | 4,329.86 mi (6,968.23 km) |
| Merthyr Tudful to Key West (Florida) | 4,416.22 mi (7,107.22 km) |
| Merthyr Tudful to Keystone (Florida) | 4,270.87 mi (6,873.31 km) |
| Merthyr Tudful to Kihei (Hawaii) | 7,168.78 mi (11,537.04 km) |
