| Duisburg to Olympia Heights (Florida) | 4,727.48 mi (7,608.14 km) |
| Duisburg to Omaha (Nebraska) | 4,538.50 mi (7,304.01 km) |
| Duisburg to On Top of the World Designated Place (Florida) | 4,635.09 mi (7,459.46 km) |
| Duisburg to Onalaska (Wisconsin) | 4,237.51 mi (6,819.62 km) |
| Duisburg to Oneida (New York) | 3,700.30 mi (5,955.05 km) |
| Duisburg to Oneonta (New York) | 3,704.66 mi (5,962.08 km) |
| Duisburg to Ontario (California) | 5,638.13 mi (9,073.70 km) |
| Duisburg to Ontario (Oregon) | 5,035.21 mi (8,103.38 km) |
| Duisburg to Opa-locka (Florida) | 4,714.97 mi (7,588.02 km) |
| Duisburg to Opelika (Alabama) | 4,579.04 mi (7,369.25 km) |
| Duisburg to Opelousas (Louisiana) | 4,951.55 mi (7,968.75 km) |
| Duisburg to Orange (California) | 5,658.45 mi (9,106.40 km) |
| Duisburg to Orange (Texas) | 5,037.41 mi (8,106.93 km) |
| Duisburg to Orange City (Florida) | 4,602.89 mi (7,407.63 km) |
| Duisburg to Orangeburg (South Carolina) | 4,357.37 mi (7,012.51 km) |
