| Difficult Run to Iver | 3,661.75 mi (5,893.02 km) |
| Difficult Run to Ivybridge | 3,544.05 mi (5,703.60 km) |
| Difficult Run to Jarrow | 3,553.75 mi (5,719.20 km) |
| Difficult Run to Johnstone | 3,424.95 mi (5,511.93 km) |
| Difficult Run to Kearsley | 3,546.18 mi (5,707.03 km) |
| Difficult Run to Keighley | 3,557.95 mi (5,725.97 km) |
| Difficult Run to Kempston | 3,649.37 mi (5,873.09 km) |
| Difficult Run to Kendal | 3,517.00 mi (5,660.06 km) |
| Difficult Run to Kenilworth | 3,601.50 mi (5,796.06 km) |
| Difficult Run to Kenley | 3,682.83 mi (5,926.95 km) |
| Difficult Run to Kensington | 3,675.14 mi (5,914.56 km) |
| Difficult Run to Kenton | 3,668.38 mi (5,903.68 km) |
| Difficult Run to Kettering | 3,634.37 mi (5,848.96 km) |
| Difficult Run to Kew Green | 3,673.04 mi (5,911.19 km) |
| Difficult Run to Keynsham | 3,582.48 mi (5,765.44 km) |
