| Merzig to Olympia Heights (Florida) | 4,756.68 mi (7,655.13 km) |
| Merzig to Omaha (Nebraska) | 4,615.44 mi (7,427.83 km) |
| Merzig to On Top of the World Designated Place (Florida) | 4,673.25 mi (7,520.88 km) |
| Merzig to Onalaska (Wisconsin) | 4,312.84 mi (6,940.84 km) |
| Merzig to Oneida (New York) | 3,755.61 mi (6,044.07 km) |
| Merzig to Oneonta (New York) | 3,757.91 mi (6,047.77 km) |
| Merzig to Ontario (California) | 5,732.85 mi (9,226.13 km) |
| Merzig to Ontario (Oregon) | 5,138.39 mi (8,269.44 km) |
| Merzig to Opa-locka (Florida) | 4,744.34 mi (7,635.28 km) |
| Merzig to Opelika (Alabama) | 4,628.00 mi (7,448.04 km) |
| Merzig to Opelousas (Louisiana) | 5,007.03 mi (8,058.04 km) |
| Merzig to Orange (California) | 5,753.21 mi (9,258.90 km) |
| Merzig to Orange (Texas) | 5,094.78 mi (8,199.25 km) |
| Merzig to Orange City (Florida) | 4,639.18 mi (7,466.03 km) |
| Merzig to Orangeburg (South Carolina) | 4,401.09 mi (7,082.87 km) |
