| Northampton to Orbetello | 880.23 mi (1,416.59 km) |
| Northampton to Oria | 1,192.43 mi (1,919.03 km) |
| Northampton to Oristano | 963.46 mi (1,550.54 km) |
| Northampton to Orta Nova | 1,083.48 mi (1,743.69 km) |
| Northampton to Orte | 914.89 mi (1,472.38 km) |
| Northampton to Ortona | 986.08 mi (1,586.94 km) |
| Northampton to Orvieto | 892.21 mi (1,435.87 km) |
| Northampton to Orzinuovi | 680.85 mi (1,095.72 km) |
| Northampton to Osimo | 896.78 mi (1,443.23 km) |
| Northampton to Ospitaletto | 677.57 mi (1,090.44 km) |
| Northampton to Ostuni | 1,178.57 mi (1,896.73 km) |
| Northampton to Ottaviano | 1,068.94 mi (1,720.29 km) |
| Northampton to Ovada | 681.74 mi (1,097.15 km) |
| Northampton to Ozieri | 930.67 mi (1,497.77 km) |
| Northampton to Paceco | 1,178.50 mi (1,896.62 km) |
