| Grodzisk Mazowiecki to Orbetello | 799.85 mi (1,287.23 km) |
| Grodzisk Mazowiecki to Oria | 815.12 mi (1,311.81 km) |
| Grodzisk Mazowiecki to Oristano | 1,019.67 mi (1,641.00 km) |
| Grodzisk Mazowiecki to Orta Nova | 780.38 mi (1,255.90 km) |
| Grodzisk Mazowiecki to Orte | 769.94 mi (1,239.09 km) |
| Grodzisk Mazowiecki to Ortona | 734.79 mi (1,182.53 km) |
| Grodzisk Mazowiecki to Orvieto | 760.70 mi (1,224.24 km) |
| Grodzisk Mazowiecki to Orzinuovi | 671.70 mi (1,080.99 km) |
| Grodzisk Mazowiecki to Osimo | 681.83 mi (1,097.30 km) |
| Grodzisk Mazowiecki to Ospitaletto | 659.21 mi (1,060.89 km) |
| Grodzisk Mazowiecki to Ostuni | 799.63 mi (1,286.88 km) |
| Grodzisk Mazowiecki to Ottaviano | 830.97 mi (1,337.32 km) |
| Grodzisk Mazowiecki to Ovada | 752.90 mi (1,211.68 km) |
| Grodzisk Mazowiecki to Ozieri | 968.22 mi (1,558.20 km) |
| Grodzisk Mazowiecki to Paceco | 1,051.66 mi (1,692.48 km) |
