| Gardner to Oerlinghausen | 4,671.71 mi (7,518.39 km) |
| Gardner to Oestrich-Winkel | 4,726.17 mi (7,606.03 km) |
| Gardner to Offenburg | 4,785.17 mi (7,700.99 km) |
| Gardner to Oftersheim | 4,772.70 mi (7,680.92 km) |
| Gardner to Ohrdruf | 4,789.97 mi (7,708.71 km) |
| Gardner to Ohringen | 4,812.98 mi (7,745.74 km) |
| Gardner to Olbernhau | 4,886.91 mi (7,864.72 km) |
| Gardner to Olching | 4,920.73 mi (7,919.14 km) |
| Gardner to Oldenburg | 4,609.81 mi (7,418.77 km) |
| Gardner to Oldenburg in Holstein | 4,653.43 mi (7,488.97 km) |
| Gardner to Olfen | 4,636.45 mi (7,461.65 km) |
| Gardner to Olpe | 4,679.86 mi (7,531.50 km) |
| Gardner to Olsberg | 4,689.74 mi (7,547.41 km) |
| Gardner to Oranienburg | 4,794.74 mi (7,716.39 km) |
| Gardner to Ortenberg | 4,749.90 mi (7,644.23 km) |
