| Riehen to Olympia Heights (Florida) | 4,836.89 mi (7,784.23 km) |
| Riehen to Omaha (Nebraska) | 4,731.09 mi (7,613.95 km) |
| Riehen to On Top of the World Designated Place (Florida) | 4,760.81 mi (7,661.78 km) |
| Riehen to Onalaska (Wisconsin) | 4,427.61 mi (7,125.55 km) |
| Riehen to Oneida (New York) | 3,857.07 mi (6,207.35 km) |
| Riehen to Oneonta (New York) | 3,857.86 mi (6,208.63 km) |
| Riehen to Ontario (California) | 5,858.68 mi (9,428.64 km) |
| Riehen to Ontario (Oregon) | 5,268.67 mi (8,479.10 km) |
| Riehen to Opa-locka (Florida) | 4,824.70 mi (7,764.61 km) |
| Riehen to Opelika (Alabama) | 4,723.97 mi (7,602.50 km) |
| Riehen to Opelousas (Louisiana) | 5,107.59 mi (8,219.87 km) |
| Riehen to Orange (California) | 5,879.07 mi (9,461.45 km) |
| Riehen to Orange (Texas) | 5,196.67 mi (8,363.23 km) |
| Riehen to Orange City (Florida) | 4,725.27 mi (7,604.58 km) |
| Riehen to Orangeburg (South Carolina) | 4,493.26 mi (7,231.20 km) |
