| Herstal to Olympia Heights (Florida) | 4,693.14 mi (7,552.88 km) |
| Herstal to Omaha (Nebraska) | 4,530.32 mi (7,290.85 km) |
| Herstal to On Top of the World Designated Place (Florida) | 4,605.12 mi (7,411.22 km) |
| Herstal to Onalaska (Wisconsin) | 4,228.29 mi (6,804.77 km) |
| Herstal to Oneida (New York) | 3,679.19 mi (5,921.08 km) |
| Herstal to Oneonta (New York) | 3,682.42 mi (5,926.28 km) |
| Herstal to Ontario (California) | 5,642.10 mi (9,080.09 km) |
| Herstal to Ontario (Oregon) | 5,045.56 mi (8,120.05 km) |
| Herstal to Opa-locka (Florida) | 4,680.72 mi (7,532.89 km) |
| Herstal to Opelika (Alabama) | 4,554.63 mi (7,329.97 km) |
| Herstal to Opelousas (Louisiana) | 4,930.73 mi (7,935.25 km) |
| Herstal to Orange (California) | 5,662.46 mi (9,112.85 km) |
| Herstal to Orange (Texas) | 5,017.65 mi (8,075.13 km) |
| Herstal to Orange City (Florida) | 4,571.98 mi (7,357.88 km) |
| Herstal to Orangeburg (South Carolina) | 4,330.18 mi (6,968.75 km) |
