| Williamstown to Oerlinghausen | 3,886.97 mi (6,255.47 km) |
| Williamstown to Oestrich-Winkel | 3,914.57 mi (6,299.89 km) |
| Williamstown to Offenburg | 3,955.48 mi (6,365.73 km) |
| Williamstown to Oftersheim | 3,956.26 mi (6,366.99 km) |
| Williamstown to Ohrdruf | 4,000.38 mi (6,437.98 km) |
| Williamstown to Ohringen | 3,998.64 mi (6,435.19 km) |
| Williamstown to Olbernhau | 4,107.52 mi (6,610.41 km) |
| Williamstown to Olching | 4,103.40 mi (6,603.79 km) |
| Williamstown to Oldenburg | 3,838.15 mi (6,176.90 km) |
| Williamstown to Oldenburg in Holstein | 3,908.22 mi (6,289.67 km) |
| Williamstown to Olfen | 3,843.14 mi (6,184.94 km) |
| Williamstown to Olpe | 3,879.80 mi (6,243.93 km) |
| Williamstown to Olsberg | 3,896.56 mi (6,270.90 km) |
| Williamstown to Oranienburg | 4,040.28 mi (6,502.21 km) |
| Williamstown to Ortenberg | 3,947.15 mi (6,352.32 km) |
