| Westerlo to Olympia Heights (Florida) | 4,655.94 mi (7,493.01 km) |
| Westerlo to Omaha (Nebraska) | 4,488.15 mi (7,222.98 km) |
| Westerlo to On Top of the World Designated Place (Florida) | 4,566.61 mi (7,349.25 km) |
| Westerlo to Onalaska (Wisconsin) | 4,186.19 mi (6,737.02 km) |
| Westerlo to Oneida (New York) | 3,638.63 mi (5,855.81 km) |
| Westerlo to Oneonta (New York) | 3,642.07 mi (5,861.35 km) |
| Westerlo to Ontario (California) | 5,599.67 mi (9,011.79 km) |
| Westerlo to Ontario (Oregon) | 5,003.47 mi (8,052.31 km) |
| Westerlo to Opa-locka (Florida) | 4,643.49 mi (7,472.98 km) |
| Westerlo to Opelika (Alabama) | 4,514.76 mi (7,265.80 km) |
| Westerlo to Opelousas (Louisiana) | 4,890.16 mi (7,869.95 km) |
| Westerlo to Orange (California) | 5,620.02 mi (9,044.55 km) |
| Westerlo to Orange (Texas) | 4,976.89 mi (8,009.53 km) |
| Westerlo to Orange City (Florida) | 4,533.73 mi (7,296.33 km) |
| Westerlo to Orangeburg (South Carolina) | 4,290.94 mi (6,905.60 km) |
