| Birsfelden to Olympia Heights (Florida) | 4,837.04 mi (7,784.46 km) |
| Birsfelden to Omaha (Nebraska) | 4,732.00 mi (7,615.43 km) |
| Birsfelden to On Top of the World Designated Place (Florida) | 4,761.10 mi (7,662.25 km) |
| Birsfelden to Onalaska (Wisconsin) | 4,428.51 mi (7,127.00 km) |
| Birsfelden to Oneida (New York) | 3,857.65 mi (6,208.29 km) |
| Birsfelden to Oneonta (New York) | 3,858.42 mi (6,209.52 km) |
| Birsfelden to Ontario (California) | 5,859.89 mi (9,430.58 km) |
| Birsfelden to Ontario (Oregon) | 5,270.03 mi (8,481.29 km) |
| Birsfelden to Opa-locka (Florida) | 4,824.85 mi (7,764.85 km) |
| Birsfelden to Opelika (Alabama) | 4,724.44 mi (7,603.25 km) |
| Birsfelden to Opelousas (Louisiana) | 5,108.15 mi (8,220.77 km) |
| Birsfelden to Orange (California) | 5,880.27 mi (9,463.39 km) |
| Birsfelden to Orange (Texas) | 5,197.25 mi (8,364.17 km) |
| Birsfelden to Orange City (Florida) | 4,725.53 mi (7,605.01 km) |
| Birsfelden to Orangeburg (South Carolina) | 4,493.64 mi (7,231.82 km) |
