| Demir Hisar to Olympia Heights (Florida) | 5,620.61 mi (9,045.50 km) |
| Demir Hisar to Omaha (Nebraska) | 5,519.39 mi (8,882.60 km) |
| Demir Hisar to On Top of the World Designated Place (Florida) | 5,553.24 mi (8,937.08 km) |
| Demir Hisar to Onalaska (Wisconsin) | 5,217.43 mi (8,396.65 km) |
| Demir Hisar to Oneida (New York) | 4,656.51 mi (7,493.93 km) |
| Demir Hisar to Oneonta (New York) | 4,657.29 mi (7,495.19 km) |
| Demir Hisar to Ontario (California) | 6,615.66 mi (10,646.87 km) |
| Demir Hisar to Ontario (Oregon) | 6,000.87 mi (9,657.47 km) |
| Demir Hisar to Opa-locka (Florida) | 5,608.64 mi (9,026.24 km) |
| Demir Hisar to Opelika (Alabama) | 5,522.33 mi (8,887.33 km) |
| Demir Hisar to Opelousas (Louisiana) | 5,907.03 mi (9,506.44 km) |
| Demir Hisar to Orange (California) | 6,635.91 mi (10,679.47 km) |
| Demir Hisar to Orange (Texas) | 5,996.11 mi (9,649.81 km) |
| Demir Hisar to Orange City (Florida) | 5,516.26 mi (8,877.56 km) |
| Demir Hisar to Orangeburg (South Carolina) | 5,289.62 mi (8,512.83 km) |
