| Walnut Park to Oerlinghausen | 5,688.85 mi (9,155.32 km) |
| Walnut Park to Oestrich-Winkel | 5,770.10 mi (9,286.08 km) |
| Walnut Park to Offenburg | 5,846.44 mi (9,408.93 km) |
| Walnut Park to Oftersheim | 5,819.89 mi (9,366.21 km) |
| Walnut Park to Ohrdruf | 5,806.71 mi (9,344.99 km) |
| Walnut Park to Ohringen | 5,856.07 mi (9,424.43 km) |
| Walnut Park to Olbernhau | 5,887.59 mi (9,475.15 km) |
| Walnut Park to Olching | 5,962.41 mi (9,595.58 km) |
| Walnut Park to Oldenburg | 5,615.85 mi (9,037.83 km) |
| Walnut Park to Oldenburg in Holstein | 5,628.41 mi (9,058.05 km) |
| Walnut Park to Olfen | 5,664.61 mi (9,116.30 km) |
| Walnut Park to Olpe | 5,713.31 mi (9,194.68 km) |
| Walnut Park to Olsberg | 5,715.23 mi (9,197.77 km) |
| Walnut Park to Oranienburg | 5,772.30 mi (9,289.63 km) |
| Walnut Park to Ortenberg | 5,783.04 mi (9,306.91 km) |
