| Morfelden-Walldorf to Olympia Heights (Florida) | 4,830.78 mi (7,774.39 km) |
| Morfelden-Walldorf to Omaha (Nebraska) | 4,661.90 mi (7,502.61 km) |
| Morfelden-Walldorf to On Top of the World Designated Place (Florida) | 4,743.12 mi (7,633.32 km) |
| Morfelden-Walldorf to Onalaska (Wisconsin) | 4,360.44 mi (7,017.45 km) |
| Morfelden-Walldorf to Oneida (New York) | 3,816.09 mi (6,141.41 km) |
| Morfelden-Walldorf to Oneonta (New York) | 3,819.59 mi (6,147.03 km) |
| Morfelden-Walldorf to Ontario (California) | 5,764.94 mi (9,277.78 km) |
| Morfelden-Walldorf to Ontario (Oregon) | 5,162.35 mi (8,308.00 km) |
| Morfelden-Walldorf to Opa-locka (Florida) | 4,818.37 mi (7,754.41 km) |
| Morfelden-Walldorf to Opelika (Alabama) | 4,692.23 mi (7,551.42 km) |
| Morfelden-Walldorf to Opelousas (Louisiana) | 5,067.61 mi (8,155.53 km) |
| Morfelden-Walldorf to Orange (California) | 5,785.27 mi (9,310.49 km) |
| Morfelden-Walldorf to Orange (Texas) | 5,154.25 mi (8,294.96 km) |
| Morfelden-Walldorf to Orange City (Florida) | 4,709.96 mi (7,579.94 km) |
| Morfelden-Walldorf to Orangeburg (South Carolina) | 4,468.09 mi (7,190.70 km) |
