| Haskovo to Olympia Heights (Florida) | 5,796.46 mi (9,328.49 km) |
| Haskovo to Omaha (Nebraska) | 5,632.13 mi (9,064.04 km) |
| Haskovo to On Top of the World Designated Place (Florida) | 5,719.11 mi (9,204.02 km) |
| Haskovo to Onalaska (Wisconsin) | 5,333.14 mi (8,582.87 km) |
| Haskovo to Oneida (New York) | 4,800.34 mi (7,725.39 km) |
| Haskovo to Oneonta (New York) | 4,803.67 mi (7,730.76 km) |
| Haskovo to Ontario (California) | 6,692.09 mi (10,769.88 km) |
| Haskovo to Ontario (Oregon) | 6,060.69 mi (9,753.75 km) |
| Haskovo to Opa-locka (Florida) | 5,784.28 mi (9,308.90 km) |
| Haskovo to Opelika (Alabama) | 5,675.23 mi (9,133.41 km) |
| Haskovo to Opelousas (Louisiana) | 6,051.86 mi (9,739.53 km) |
| Haskovo to Orange (California) | 6,712.17 mi (10,802.20 km) |
| Haskovo to Orange (Texas) | 6,138.41 mi (9,878.81 km) |
| Haskovo to Orange City (Florida) | 5,684.15 mi (9,147.76 km) |
| Haskovo to Orangeburg (South Carolina) | 5,448.50 mi (8,768.52 km) |
