| Grudziadz to Orbetello | 838.21 mi (1,348.97 km) |
| Grudziadz to Oria | 898.88 mi (1,446.60 km) |
| Grudziadz to Oristano | 1,052.37 mi (1,693.62 km) |
| Grudziadz to Orta Nova | 851.71 mi (1,370.70 km) |
| Grudziadz to Orte | 816.08 mi (1,313.35 km) |
| Grudziadz to Ortona | 795.13 mi (1,279.63 km) |
| Grudziadz to Orvieto | 803.92 mi (1,293.78 km) |
| Grudziadz to Orzinuovi | 683.96 mi (1,100.72 km) |
| Grudziadz to Osimo | 731.67 mi (1,177.50 km) |
| Grudziadz to Ospitaletto | 671.26 mi (1,080.29 km) |
| Grudziadz to Ostuni | 882.92 mi (1,420.92 km) |
| Grudziadz to Ottaviano | 895.57 mi (1,441.28 km) |
| Grudziadz to Ovada | 762.10 mi (1,226.48 km) |
| Grudziadz to Ozieri | 1,000.68 mi (1,610.43 km) |
| Grudziadz to Paceco | 1,111.20 mi (1,788.30 km) |
