| Guimaraes to Oerlinghausen | 1,078.75 mi (1,736.08 km) |
| Guimaraes to Oestrich-Winkel | 979.90 mi (1,577.00 km) |
| Guimaraes to Offenburg | 927.20 mi (1,492.19 km) |
| Guimaraes to Oftersheim | 981.54 mi (1,579.63 km) |
| Guimaraes to Ohrdruf | 1,112.78 mi (1,790.85 km) |
| Guimaraes to Ohringen | 1,013.28 mi (1,630.72 km) |
| Guimaraes to Olbernhau | 1,210.33 mi (1,947.83 km) |
| Guimaraes to Olching | 1,064.38 mi (1,712.96 km) |
| Guimaraes to Oldenburg | 1,113.54 mi (1,792.06 km) |
| Guimaraes to Oldenburg in Holstein | 1,248.64 mi (2,009.49 km) |
| Guimaraes to Olfen | 1,024.48 mi (1,648.75 km) |
| Guimaraes to Olpe | 1,011.68 mi (1,628.14 km) |
| Guimaraes to Olsberg | 1,047.92 mi (1,686.46 km) |
| Guimaraes to Oranienburg | 1,270.68 mi (2,044.96 km) |
| Guimaraes to Ortenberg | 1,032.62 mi (1,661.84 km) |
