| Hadamar to Oswego (Illinois) | 4,326.72 mi (6,963.18 km) |
| Hadamar to Oswego (New York) | 3,797.14 mi (6,110.90 km) |
| Hadamar to Otsego (Minnesota) | 4,339.04 mi (6,983.01 km) |
| Hadamar to Ottawa (Illinois) | 4,360.63 mi (7,017.75 km) |
| Hadamar to Ottawa (Kansas) | 4,733.09 mi (7,617.18 km) |
| Hadamar to Ottumwa (Iowa) | 4,507.84 mi (7,254.67 km) |
| Hadamar to Overland (Missouri) | 4,549.00 mi (7,320.91 km) |
| Hadamar to Overland Park (Kansas) | 4,697.56 mi (7,559.99 km) |
| Hadamar to Overlea (Maryland) | 3,980.58 mi (6,406.12 km) |
| Hadamar to Oviedo (Florida) | 4,687.14 mi (7,543.23 km) |
| Hadamar to Owasso (Oklahoma) | 4,873.56 mi (7,843.23 km) |
| Hadamar to Owatonna (Minnesota) | 4,383.67 mi (7,054.84 km) |
| Hadamar to Owensboro (Kentucky) | 4,472.77 mi (7,198.23 km) |
| Hadamar to Owings Mills (Maryland) | 3,989.39 mi (6,420.30 km) |
| Hadamar to Owosso (Michigan) | 4,110.15 mi (6,614.65 km) |
