| Mettlach to Olympia Heights (Florida) | 4,755.07 mi (7,652.55 km) |
| Mettlach to Omaha (Nebraska) | 4,613.00 mi (7,423.91 km) |
| Mettlach to On Top of the World Designated Place (Florida) | 4,671.48 mi (7,518.02 km) |
| Mettlach to Onalaska (Wisconsin) | 4,310.43 mi (6,936.96 km) |
| Mettlach to Oneida (New York) | 3,753.52 mi (6,040.70 km) |
| Mettlach to Oneonta (New York) | 3,755.86 mi (6,044.47 km) |
| Mettlach to Ontario (California) | 5,730.16 mi (9,221.80 km) |
| Mettlach to Ontario (Oregon) | 5,135.59 mi (8,264.93 km) |
| Mettlach to Opa-locka (Florida) | 4,742.73 mi (7,632.69 km) |
| Mettlach to Opelika (Alabama) | 4,626.03 mi (7,444.88 km) |
| Mettlach to Opelousas (Louisiana) | 5,004.95 mi (8,054.69 km) |
| Mettlach to Orange (California) | 5,750.52 mi (9,254.57 km) |
| Mettlach to Orange (Texas) | 5,092.67 mi (8,195.86 km) |
| Mettlach to Orange City (Florida) | 4,637.44 mi (7,463.24 km) |
| Mettlach to Orangeburg (South Carolina) | 4,399.21 mi (7,079.85 km) |
