| Morlanwelz-Mariemont to Oswego (Illinois) | 4,184.60 mi (6,734.46 km) |
| Morlanwelz-Mariemont to Oswego (New York) | 3,647.48 mi (5,870.05 km) |
| Morlanwelz-Mariemont to Otsego (Minnesota) | 4,206.95 mi (6,770.44 km) |
| Morlanwelz-Mariemont to Ottawa (Illinois) | 4,218.54 mi (6,789.09 km) |
| Morlanwelz-Mariemont to Ottawa (Kansas) | 4,593.87 mi (7,393.12 km) |
| Morlanwelz-Mariemont to Ottumwa (Iowa) | 4,368.75 mi (7,030.82 km) |
| Morlanwelz-Mariemont to Overland (Missouri) | 4,405.11 mi (7,089.34 km) |
| Morlanwelz-Mariemont to Overland Park (Kansas) | 4,558.09 mi (7,335.54 km) |
| Morlanwelz-Mariemont to Overlea (Maryland) | 3,826.18 mi (6,157.64 km) |
| Morlanwelz-Mariemont to Oviedo (Florida) | 4,526.88 mi (7,285.31 km) |
| Morlanwelz-Mariemont to Owasso (Oklahoma) | 4,732.23 mi (7,615.79 km) |
| Morlanwelz-Mariemont to Owatonna (Minnesota) | 4,249.51 mi (6,838.92 km) |
| Morlanwelz-Mariemont to Owensboro (Kentucky) | 4,324.90 mi (6,960.25 km) |
| Morlanwelz-Mariemont to Owings Mills (Maryland) | 3,835.23 mi (6,172.21 km) |
| Morlanwelz-Mariemont to Owosso (Michigan) | 3,966.04 mi (6,382.73 km) |
