| Mentana to Oerlinghausen | 712.37 mi (1,146.44 km) |
| Mentana to Oestrich-Winkel | 594.72 mi (957.11 km) |
| Mentana to Offenburg | 501.02 mi (806.31 km) |
| Mentana to Oftersheim | 544.46 mi (876.22 km) |
| Mentana to Ohrdruf | 615.56 mi (990.65 km) |
| Mentana to Ohringen | 519.02 mi (835.29 km) |
| Mentana to Olbernhau | 598.54 mi (963.25 km) |
| Mentana to Olching | 432.12 mi (695.44 km) |
| Mentana to Oldenburg | 795.73 mi (1,280.61 km) |
| Mentana to Oldenburg in Holstein | 852.52 mi (1,372.00 km) |
| Mentana to Olfen | 714.42 mi (1,149.75 km) |
| Mentana to Olpe | 662.31 mi (1,065.88 km) |
| Mentana to Olsberg | 674.15 mi (1,084.94 km) |
| Mentana to Oranienburg | 742.40 mi (1,194.78 km) |
| Mentana to Ortenberg | 601.10 mi (967.37 km) |
