| Diest to Olympia Heights (Florida) | 4,663.22 mi (7,504.73 km) |
| Diest to Omaha (Nebraska) | 4,496.87 mi (7,237.02 km) |
| Diest to On Top of the World Designated Place (Florida) | 4,574.23 mi (7,361.52 km) |
| Diest to Onalaska (Wisconsin) | 4,194.88 mi (6,751.00 km) |
| Diest to Oneida (New York) | 3,646.82 mi (5,868.98 km) |
| Diest to Oneonta (New York) | 3,650.20 mi (5,874.43 km) |
| Diest to Ontario (California) | 5,608.62 mi (9,026.21 km) |
| Diest to Ontario (Oregon) | 5,012.46 mi (8,066.77 km) |
| Diest to Opa-locka (Florida) | 4,650.78 mi (7,484.71 km) |
| Diest to Opelika (Alabama) | 4,522.75 mi (7,278.67 km) |
| Diest to Opelousas (Louisiana) | 4,898.35 mi (7,883.14 km) |
| Diest to Orange (California) | 5,628.98 mi (9,058.96 km) |
| Diest to Orange (Texas) | 4,985.14 mi (8,022.81 km) |
| Diest to Orange City (Florida) | 4,541.28 mi (7,308.49 km) |
| Diest to Orangeburg (South Carolina) | 4,298.76 mi (6,918.18 km) |
