| Boortmeerbeek to Olympia Heights (Florida) | 4,642.74 mi (7,471.77 km) |
| Boortmeerbeek to Omaha (Nebraska) | 4,479.75 mi (7,209.46 km) |
| Boortmeerbeek to On Top of the World Designated Place (Florida) | 4,554.13 mi (7,329.17 km) |
| Boortmeerbeek to Onalaska (Wisconsin) | 4,177.59 mi (6,723.18 km) |
| Boortmeerbeek to Oneida (New York) | 3,627.75 mi (5,838.30 km) |
| Boortmeerbeek to Oneonta (New York) | 3,630.99 mi (5,843.51 km) |
| Boortmeerbeek to Ontario (California) | 5,593.76 mi (9,002.29 km) |
| Boortmeerbeek to Ontario (Oregon) | 4,999.01 mi (8,045.14 km) |
| Boortmeerbeek to Opa-locka (Florida) | 4,630.30 mi (7,451.75 km) |
| Boortmeerbeek to Opelika (Alabama) | 4,503.26 mi (7,247.29 km) |
| Boortmeerbeek to Opelousas (Louisiana) | 4,879.30 mi (7,852.47 km) |
| Boortmeerbeek to Orange (California) | 5,614.12 mi (9,035.06 km) |
| Boortmeerbeek to Orange (Texas) | 4,966.23 mi (7,992.37 km) |
| Boortmeerbeek to Orange City (Florida) | 4,521.09 mi (7,276.00 km) |
| Boortmeerbeek to Orangeburg (South Carolina) | 4,278.95 mi (6,886.30 km) |
