| Guimaraes to Orbetello | 1,002.88 mi (1,613.98 km) |
| Guimaraes to Oria | 1,349.34 mi (2,171.56 km) |
| Guimaraes to Oristano | 890.07 mi (1,432.43 km) |
| Guimaraes to Orta Nova | 1,240.65 mi (1,996.63 km) |
| Guimaraes to Orte | 1,062.55 mi (1,710.02 km) |
| Guimaraes to Ortona | 1,165.58 mi (1,875.82 km) |
| Guimaraes to Orvieto | 1,047.70 mi (1,686.11 km) |
| Guimaraes to Orzinuovi | 952.40 mi (1,532.74 km) |
| Guimaraes to Osimo | 1,115.86 mi (1,795.80 km) |
| Guimaraes to Ospitaletto | 961.01 mi (1,546.59 km) |
| Guimaraes to Ostuni | 1,343.70 mi (2,162.47 km) |
| Guimaraes to Ottaviano | 1,182.34 mi (1,902.79 km) |
| Guimaraes to Ovada | 881.82 mi (1,419.16 km) |
| Guimaraes to Ozieri | 902.52 mi (1,452.46 km) |
| Guimaraes to Paceco | 1,130.75 mi (1,819.77 km) |
