| Ilmenau to Olympia Heights (Florida) | 4,915.27 mi (7,910.36 km) |
| Ilmenau to Omaha (Nebraska) | 4,712.83 mi (7,584.57 km) |
| Ilmenau to On Top of the World Designated Place (Florida) | 4,822.42 mi (7,760.93 km) |
| Ilmenau to Onalaska (Wisconsin) | 4,412.95 mi (7,101.96 km) |
| Ilmenau to Oneida (New York) | 3,884.50 mi (6,251.49 km) |
| Ilmenau to Oneonta (New York) | 3,889.43 mi (6,259.43 km) |
| Ilmenau to Ontario (California) | 5,797.82 mi (9,330.69 km) |
| Ilmenau to Ontario (Oregon) | 5,185.93 mi (8,345.95 km) |
| Ilmenau to Opa-locka (Florida) | 4,902.77 mi (7,890.24 km) |
| Ilmenau to Opelika (Alabama) | 4,764.66 mi (7,667.98 km) |
| Ilmenau to Opelousas (Louisiana) | 5,135.39 mi (8,264.62 km) |
| Ilmenau to Orange (California) | 5,818.08 mi (9,363.29 km) |
| Ilmenau to Orange (Texas) | 5,220.63 mi (8,401.80 km) |
| Ilmenau to Orange City (Florida) | 4,790.39 mi (7,709.38 km) |
| Ilmenau to Orangeburg (South Carolina) | 4,544.01 mi (7,312.88 km) |
