| Hennef to Oswego (Illinois) | 4,285.98 mi (6,897.63 km) |
| Hennef to Oswego (New York) | 3,756.67 mi (6,045.78 km) |
| Hennef to Otsego (Minnesota) | 4,298.42 mi (6,917.64 km) |
| Hennef to Ottawa (Illinois) | 4,319.90 mi (6,952.20 km) |
| Hennef to Ottawa (Kansas) | 4,692.35 mi (7,551.61 km) |
| Hennef to Ottumwa (Iowa) | 4,467.10 mi (7,189.10 km) |
| Hennef to Overland (Missouri) | 4,508.30 mi (7,255.40 km) |
| Hennef to Overland Park (Kansas) | 4,656.82 mi (7,494.42 km) |
| Hennef to Overlea (Maryland) | 3,940.51 mi (6,341.64 km) |
| Hennef to Oviedo (Florida) | 4,647.99 mi (7,480.23 km) |
| Hennef to Owasso (Oklahoma) | 4,832.82 mi (7,777.67 km) |
| Hennef to Owatonna (Minnesota) | 4,343.00 mi (6,989.38 km) |
| Hennef to Owensboro (Kentucky) | 4,432.20 mi (7,132.93 km) |
| Hennef to Owings Mills (Maryland) | 3,949.29 mi (6,355.77 km) |
| Hennef to Owosso (Michigan) | 4,069.45 mi (6,549.15 km) |
