| Rock Ferry to Oerlinghausen | 498.11 mi (801.63 km) |
| Rock Ferry to Oestrich-Winkel | 525.22 mi (845.27 km) |
| Rock Ferry to Offenburg | 583.82 mi (939.57 km) |
| Rock Ferry to Oftersheim | 570.43 mi (918.03 km) |
| Rock Ferry to Ohrdruf | 608.02 mi (978.51 km) |
| Rock Ferry to Ohringen | 611.42 mi (983.99 km) |
| Rock Ferry to Olbernhau | 717.75 mi (1,155.11 km) |
| Rock Ferry to Olching | 718.74 mi (1,156.71 km) |
| Rock Ferry to Oldenburg | 463.62 mi (746.12 km) |
| Rock Ferry to Oldenburg in Holstein | 569.04 mi (915.78 km) |
| Rock Ferry to Olfen | 450.92 mi (725.68 km) |
| Rock Ferry to Olpe | 486.58 mi (783.08 km) |
| Rock Ferry to Olsberg | 503.97 mi (811.06 km) |
| Rock Ferry to Oranienburg | 674.38 mi (1,085.30 km) |
| Rock Ferry to Ortenberg | 554.45 mi (892.30 km) |
