| Morlanwelz-Mariemont to Orangevale (California) | 5,446.78 mi (8,765.75 km) |
| Morlanwelz-Mariemont to Orchards (Washington) | 5,072.14 mi (8,162.82 km) |
| Morlanwelz-Mariemont to Orcutt (California) | 5,647.35 mi (9,088.54 km) |
| Morlanwelz-Mariemont to Oregon (Ohio) | 3,998.43 mi (6,434.86 km) |
| Morlanwelz-Mariemont to Oregon (Wisconsin) | 4,165.35 mi (6,703.48 km) |
| Morlanwelz-Mariemont to Oregon City (Oregon) | 5,094.05 mi (8,198.08 km) |
| Morlanwelz-Mariemont to Orem (Utah) | 5,068.84 mi (8,157.50 km) |
| Morlanwelz-Mariemont to Orinda (California) | 5,521.53 mi (8,886.04 km) |
| Morlanwelz-Mariemont to Orland Park (Illinois) | 4,170.23 mi (6,711.33 km) |
| Morlanwelz-Mariemont to Orlando (Florida) | 4,542.17 mi (7,309.92 km) |
| Morlanwelz-Mariemont to Ormond Beach (Florida) | 4,491.60 mi (7,228.53 km) |
| Morlanwelz-Mariemont to Oro Valley (Arizona) | 5,483.99 mi (8,825.62 km) |
| Morlanwelz-Mariemont to Oroville (California) | 5,408.85 mi (8,704.70 km) |
| Morlanwelz-Mariemont to Oshkosh (Wisconsin) | 4,083.51 mi (6,571.77 km) |
| Morlanwelz-Mariemont to Oskaloosa (Iowa) | 4,363.63 mi (7,022.58 km) |
