| Hackensack to Oerlinghausen | 3,794.82 mi (6,107.18 km) |
| Hackensack to Oestrich-Winkel | 3,823.69 mi (6,153.64 km) |
| Hackensack to Offenburg | 3,865.60 mi (6,221.09 km) |
| Hackensack to Oftersheim | 3,865.67 mi (6,221.20 km) |
| Hackensack to Ohrdruf | 3,908.54 mi (6,290.19 km) |
| Hackensack to Ohringen | 3,907.98 mi (6,289.29 km) |
| Hackensack to Olbernhau | 4,015.34 mi (6,462.06 km) |
| Hackensack to Olching | 4,013.00 mi (6,458.29 km) |
| Hackensack to Oldenburg | 3,745.43 mi (6,027.69 km) |
| Hackensack to Oldenburg in Holstein | 3,814.61 mi (6,139.02 km) |
| Hackensack to Olfen | 3,751.34 mi (6,037.19 km) |
| Hackensack to Olpe | 3,788.33 mi (6,096.73 km) |
| Hackensack to Olsberg | 3,804.79 mi (6,123.22 km) |
| Hackensack to Oranienburg | 3,947.09 mi (6,352.23 km) |
| Hackensack to Ortenberg | 3,855.87 mi (6,205.42 km) |
