| Northampton to Oswego (Illinois) | 3,931.49 mi (6,327.13 km) |
| Northampton to Oswego (New York) | 3,395.45 mi (5,464.46 km) |
| Northampton to Otsego (Minnesota) | 3,955.29 mi (6,365.42 km) |
| Northampton to Ottawa (Illinois) | 3,965.44 mi (6,381.75 km) |
| Northampton to Ottawa (Kansas) | 4,340.88 mi (6,985.98 km) |
| Northampton to Ottumwa (Iowa) | 4,115.78 mi (6,623.71 km) |
| Northampton to Overland (Missouri) | 4,152.07 mi (6,682.10 km) |
| Northampton to Overland Park (Kansas) | 4,305.09 mi (6,928.37 km) |
| Northampton to Overlea (Maryland) | 3,576.39 mi (5,755.64 km) |
| Northampton to Oviedo (Florida) | 4,282.69 mi (6,892.32 km) |
| Northampton to Owasso (Oklahoma) | 4,479.13 mi (7,208.46 km) |
| Northampton to Owatonna (Minnesota) | 3,997.33 mi (6,433.08 km) |
| Northampton to Owensboro (Kentucky) | 4,072.42 mi (6,553.93 km) |
| Northampton to Owings Mills (Maryland) | 3,585.29 mi (5,769.96 km) |
| Northampton to Owosso (Michigan) | 3,713.00 mi (5,975.50 km) |
