| Barberton to Oerlinghausen | 4,078.29 mi (6,563.38 km) |
| Barberton to Oestrich-Winkel | 4,118.02 mi (6,627.31 km) |
| Barberton to Offenburg | 4,167.31 mi (6,706.63 km) |
| Barberton to Oftersheim | 4,162.09 mi (6,698.24 km) |
| Barberton to Ohrdruf | 4,194.44 mi (6,750.30 km) |
| Barberton to Ohringen | 4,203.73 mi (6,765.24 km) |
| Barberton to Olbernhau | 4,297.64 mi (6,916.38 km) |
| Barberton to Olching | 4,310.31 mi (6,936.78 km) |
| Barberton to Oldenburg | 4,023.43 mi (6,475.09 km) |
| Barberton to Oldenburg in Holstein | 4,082.36 mi (6,569.93 km) |
| Barberton to Olfen | 4,038.04 mi (6,498.60 km) |
| Barberton to Olpe | 4,077.90 mi (6,562.75 km) |
| Barberton to Olsberg | 4,091.68 mi (6,584.92 km) |
| Barberton to Oranienburg | 4,219.19 mi (6,790.13 km) |
| Barberton to Ortenberg | 4,146.79 mi (6,673.62 km) |
