| Potomac to Lombard (Illinois) | 601.84 mi (968.57 km) |
| Potomac to Lomita (California) | 2,295.44 mi (3,694.15 km) |
| Potomac to Lompoc (California) | 2,389.40 mi (3,845.36 km) |
| Potomac to London (Ohio) | 338.49 mi (544.75 km) |
| Potomac to Lone Tree (Colorado) | 1,474.95 mi (2,373.70 km) |
| Potomac to Long Beach (California) | 2,287.27 mi (3,681.01 km) |
| Potomac to Long Beach (Mississippi) | 904.05 mi (1,454.93 km) |
| Potomac to Long Beach (New York) | 216.57 mi (348.53 km) |
| Potomac to Long Branch (New Jersey) | 192.02 mi (309.02 km) |
| Potomac to Longmont (Colorado) | 1,481.87 mi (2,384.83 km) |
| Potomac to Longview (Texas) | 1,079.88 mi (1,737.89 km) |
| Potomac to Longview (Washington) | 2,346.23 mi (3,775.90 km) |
| Potomac to Longwood (Florida) | 751.11 mi (1,208.79 km) |
| Potomac to Lorain (Ohio) | 312.00 mi (502.12 km) |
| Potomac to Lorton (Virginia) | 21.85 mi (35.17 km) |
