| Karlovo to Red Bank (New Jersey) | 4,793.95 mi (7,715.12 km) |
| Karlovo to Red Bank (Tennessee) | 5,490.57 mi (8,836.22 km) |
| Karlovo to Red Bluff (California) | 6,355.48 mi (10,228.15 km) |
| Karlovo to Red Hill (South Carolina) | 5,297.21 mi (8,525.03 km) |
| Karlovo to Red Oak (Texas) | 6,062.94 mi (9,757.36 km) |
| Karlovo to Red Wing (Minnesota) | 5,282.10 mi (8,500.71 km) |
| Karlovo to Redan (Georgia) | 5,512.38 mi (8,871.32 km) |
| Karlovo to Redding (California) | 6,332.98 mi (10,191.95 km) |
| Karlovo to Redland (Maryland) | 4,973.22 mi (8,003.62 km) |
| Karlovo to Redlands (California) | 6,618.11 mi (10,650.82 km) |
| Karlovo to Redmond (Oregon) | 6,075.34 mi (9,777.32 km) |
| Karlovo to Redmond (Washington) | 5,878.14 mi (9,459.96 km) |
| Karlovo to Redondo Beach (California) | 6,661.10 mi (10,720.01 km) |
| Karlovo to Redwood City (California) | 6,524.21 mi (10,499.69 km) |
| Karlovo to Reedley (California) | 6,517.19 mi (10,488.41 km) |
