| Guymon to Oerlinghausen | 5,010.24 mi (8,063.20 km) |
| Guymon to Oestrich-Winkel | 5,070.83 mi (8,160.71 km) |
| Guymon to Offenburg | 5,133.79 mi (8,262.03 km) |
| Guymon to Oftersheim | 5,118.25 mi (8,237.03 km) |
| Guymon to Ohrdruf | 5,128.93 mi (8,254.21 km) |
| Guymon to Ohringen | 5,157.80 mi (8,300.68 km) |
| Guymon to Olbernhau | 5,222.73 mi (8,405.17 km) |
| Guymon to Olching | 5,265.67 mi (8,474.28 km) |
| Guymon to Oldenburg | 4,945.56 mi (7,959.11 km) |
| Guymon to Oldenburg in Holstein | 4,982.30 mi (8,018.24 km) |
| Guymon to Olfen | 4,977.27 mi (8,010.15 km) |
| Guymon to Olpe | 5,022.04 mi (8,082.19 km) |
| Guymon to Olsberg | 5,030.21 mi (8,095.33 km) |
| Guymon to Oranienburg | 5,124.91 mi (8,247.75 km) |
| Guymon to Ortenberg | 5,092.30 mi (8,195.27 km) |
