| Guarda to Oerlinghausen | 1,094.61 mi (1,761.60 km) |
| Guarda to Oestrich-Winkel | 988.42 mi (1,590.72 km) |
| Guarda to Offenburg | 928.07 mi (1,493.59 km) |
| Guarda to Oftersheim | 985.85 mi (1,586.58 km) |
| Guarda to Ohrdruf | 1,120.17 mi (1,802.73 km) |
| Guarda to Ohringen | 1,015.13 mi (1,633.70 km) |
| Guarda to Olbernhau | 1,213.28 mi (1,952.58 km) |
| Guarda to Olching | 1,058.59 mi (1,703.63 km) |
| Guarda to Oldenburg | 1,134.78 mi (1,826.26 km) |
| Guarda to Oldenburg in Holstein | 1,269.20 mi (2,042.58 km) |
| Guarda to Olfen | 1,041.92 mi (1,676.81 km) |
| Guarda to Olpe | 1,025.20 mi (1,649.90 km) |
| Guarda to Olsberg | 1,061.57 mi (1,708.43 km) |
| Guarda to Oranienburg | 1,282.14 mi (2,063.40 km) |
| Guarda to Ortenberg | 1,040.78 mi (1,674.97 km) |
