| Difficult Run to Lomita (California) | 2,287.80 mi (3,681.85 km) |
| Difficult Run to Lompoc (California) | 2,382.14 mi (3,833.68 km) |
| Difficult Run to London (Ohio) | 332.25 mi (534.71 km) |
| Difficult Run to Lone Tree (Colorado) | 1,468.26 mi (2,362.94 km) |
| Difficult Run to Long Beach (California) | 2,279.62 mi (3,668.69 km) |
| Difficult Run to Long Beach (Mississippi) | 892.80 mi (1,436.83 km) |
| Difficult Run to Long Beach (New York) | 227.64 mi (366.34 km) |
| Difficult Run to Long Branch (New Jersey) | 202.96 mi (326.64 km) |
| Difficult Run to Longmont (Colorado) | 1,475.47 mi (2,374.54 km) |
| Difficult Run to Longview (Texas) | 1,069.58 mi (1,721.32 km) |
| Difficult Run to Longview (Washington) | 2,342.51 mi (3,769.91 km) |
| Difficult Run to Longwood (Florida) | 741.04 mi (1,192.59 km) |
| Difficult Run to Lorain (Ohio) | 309.75 mi (498.49 km) |
| Difficult Run to Lorton (Virginia) | 15.71 mi (25.28 km) |
| Difficult Run to Los Alamitos (California) | 2,273.85 mi (3,659.40 km) |
