| Rockville to Lombard (Illinois) | 601.95 mi (968.75 km) |
| Rockville to Lomita (California) | 2,297.20 mi (3,696.98 km) |
| Rockville to Lompoc (California) | 2,390.93 mi (3,847.83 km) |
| Rockville to London (Ohio) | 339.55 mi (546.46 km) |
| Rockville to Lone Tree (Colorado) | 1,476.16 mi (2,375.66 km) |
| Rockville to Long Beach (California) | 2,289.03 mi (3,683.85 km) |
| Rockville to Long Beach (Mississippi) | 908.64 mi (1,462.32 km) |
| Rockville to Long Beach (New York) | 212.32 mi (341.69 km) |
| Rockville to Long Branch (New Jersey) | 187.92 mi (302.43 km) |
| Rockville to Longmont (Colorado) | 1,482.92 mi (2,386.53 km) |
| Rockville to Longview (Texas) | 1,083.43 mi (1,743.61 km) |
| Rockville to Longview (Washington) | 2,345.90 mi (3,775.36 km) |
| Rockville to Longwood (Florida) | 756.32 mi (1,217.18 km) |
| Rockville to Lorain (Ohio) | 311.09 mi (500.66 km) |
| Rockville to Lorton (Virginia) | 26.81 mi (43.15 km) |
