| Brussels to Olympia Heights (Florida) | 4,635.81 mi (7,460.61 km) |
| Brussels to Omaha (Nebraska) | 4,477.58 mi (7,205.96 km) |
| Brussels to On Top of the World Designated Place (Florida) | 4,547.99 mi (7,319.28 km) |
| Brussels to Onalaska (Wisconsin) | 4,175.24 mi (6,719.39 km) |
| Brussels to Oneida (New York) | 3,623.25 mi (5,831.06 km) |
| Brussels to Oneonta (New York) | 3,626.28 mi (5,835.93 km) |
| Brussels to Ontario (California) | 5,593.76 mi (9,002.29 km) |
| Brussels to Ontario (Oregon) | 5,000.23 mi (8,047.09 km) |
| Brussels to Opa-locka (Florida) | 4,623.38 mi (7,440.62 km) |
| Brussels to Opelika (Alabama) | 4,498.12 mi (7,239.02 km) |
| Brussels to Opelousas (Louisiana) | 4,874.80 mi (7,845.23 km) |
| Brussels to Orange (California) | 5,614.13 mi (9,035.07 km) |
| Brussels to Orange (Texas) | 4,961.92 mi (7,985.43 km) |
| Brussels to Orange City (Florida) | 4,514.78 mi (7,265.84 km) |
| Brussels to Orangeburg (South Carolina) | 4,273.31 mi (6,877.24 km) |
