| Mersch to Olympia Heights (Florida) | 4,728.95 mi (7,610.51 km) |
| Mersch to Omaha (Nebraska) | 4,584.49 mi (7,378.02 km) |
| Mersch to On Top of the World Designated Place (Florida) | 4,644.64 mi (7,474.83 km) |
| Mersch to Onalaska (Wisconsin) | 4,281.93 mi (6,891.10 km) |
| Mersch to Oneida (New York) | 3,725.61 mi (5,995.79 km) |
| Mersch to Oneonta (New York) | 3,728.05 mi (5,999.71 km) |
| Mersch to Ontario (California) | 5,701.87 mi (9,176.27 km) |
| Mersch to Ontario (Oregon) | 5,107.75 mi (8,220.13 km) |
| Mersch to Opa-locka (Florida) | 4,716.60 mi (7,590.63 km) |
| Mersch to Opelika (Alabama) | 4,598.48 mi (7,400.54 km) |
| Mersch to Opelousas (Louisiana) | 4,977.07 mi (8,009.82 km) |
| Mersch to Orange (California) | 5,722.24 mi (9,209.05 km) |
| Mersch to Orange (Texas) | 5,064.70 mi (8,150.85 km) |
| Mersch to Orange City (Florida) | 4,610.74 mi (7,420.27 km) |
| Mersch to Orangeburg (South Carolina) | 4,371.98 mi (7,036.02 km) |
