| Youngstown to Oerlinghausen | 4,038.04 mi (6,498.59 km) |
| Youngstown to Oestrich-Winkel | 4,076.61 mi (6,560.67 km) |
| Youngstown to Offenburg | 4,125.13 mi (6,638.76 km) |
| Youngstown to Oftersheim | 4,120.48 mi (6,631.27 km) |
| Youngstown to Ohrdruf | 4,153.96 mi (6,685.15 km) |
| Youngstown to Ohringen | 4,162.19 mi (6,698.40 km) |
| Youngstown to Olbernhau | 4,257.58 mi (6,851.91 km) |
| Youngstown to Olching | 4,268.64 mi (6,869.72 km) |
| Youngstown to Oldenburg | 3,983.75 mi (6,411.22 km) |
| Youngstown to Oldenburg in Holstein | 4,043.82 mi (6,507.90 km) |
| Youngstown to Olfen | 3,997.43 mi (6,433.24 km) |
| Youngstown to Olpe | 4,036.99 mi (6,496.91 km) |
| Youngstown to Olsberg | 4,051.06 mi (6,519.55 km) |
| Youngstown to Oranienburg | 4,180.22 mi (6,727.41 km) |
| Youngstown to Ortenberg | 4,105.76 mi (6,607.58 km) |
