| Giannitsa to Oerlinghausen | 1,009.31 mi (1,624.33 km) |
| Giannitsa to Oestrich-Winkel | 942.40 mi (1,516.64 km) |
| Giannitsa to Offenburg | 885.22 mi (1,424.62 km) |
| Giannitsa to Oftersheim | 895.47 mi (1,441.12 km) |
| Giannitsa to Ohrdruf | 890.79 mi (1,433.60 km) |
| Giannitsa to Ohringen | 855.46 mi (1,376.73 km) |
| Giannitsa to Olbernhau | 809.56 mi (1,302.87 km) |
| Giannitsa to Olching | 747.62 mi (1,203.17 km) |
| Giannitsa to Oldenburg | 1,080.69 mi (1,739.20 km) |
| Giannitsa to Oldenburg in Holstein | 1,074.27 mi (1,728.87 km) |
| Giannitsa to Olfen | 1,037.89 mi (1,670.32 km) |
| Giannitsa to Olpe | 991.80 mi (1,596.14 km) |
| Giannitsa to Olsberg | 985.71 mi (1,586.35 km) |
| Giannitsa to Oranienburg | 932.18 mi (1,500.19 km) |
| Giannitsa to Ortenberg | 921.47 mi (1,482.96 km) |
