| Monchengladbach to Olympia Heights (Florida) | 4,717.79 mi (7,592.55 km) |
| Monchengladbach to Omaha (Nebraska) | 4,536.68 mi (7,301.08 km) |
| Monchengladbach to On Top of the World Designated Place (Florida) | 4,626.72 mi (7,445.99 km) |
| Monchengladbach to Onalaska (Wisconsin) | 4,235.37 mi (6,816.16 km) |
| Monchengladbach to Oneida (New York) | 3,694.56 mi (5,945.82 km) |
| Monchengladbach to Oneonta (New York) | 3,698.59 mi (5,952.30 km) |
| Monchengladbach to Ontario (California) | 5,639.98 mi (9,076.67 km) |
| Monchengladbach to Ontario (Oregon) | 5,038.93 mi (8,109.38 km) |
| Monchengladbach to Opa-locka (Florida) | 4,705.32 mi (7,572.47 km) |
| Monchengladbach to Opelika (Alabama) | 4,572.35 mi (7,358.48 km) |
| Monchengladbach to Opelousas (Louisiana) | 4,945.96 mi (7,959.75 km) |
| Monchengladbach to Orange (California) | 5,660.31 mi (9,109.39 km) |
| Monchengladbach to Orange (Texas) | 5,032.13 mi (8,098.44 km) |
| Monchengladbach to Orange City (Florida) | 4,594.24 mi (7,393.71 km) |
| Monchengladbach to Orangeburg (South Carolina) | 4,349.83 mi (7,000.38 km) |
