| Walnut Creek to Oerlinghausen | 5,554.95 mi (8,939.83 km) |
| Walnut Creek to Oestrich-Winkel | 5,645.13 mi (9,084.96 km) |
| Walnut Creek to Offenburg | 5,727.25 mi (9,217.12 km) |
| Walnut Creek to Oftersheim | 5,695.55 mi (9,166.10 km) |
| Walnut Creek to Ohrdruf | 5,671.19 mi (9,126.89 km) |
| Walnut Creek to Ohringen | 5,729.72 mi (9,221.09 km) |
| Walnut Creek to Olbernhau | 5,745.32 mi (9,246.20 km) |
| Walnut Creek to Olching | 5,834.24 mi (9,389.31 km) |
| Walnut Creek to Oldenburg | 5,478.88 mi (8,817.41 km) |
| Walnut Creek to Oldenburg in Holstein | 5,480.56 mi (8,820.10 km) |
| Walnut Creek to Olfen | 5,535.03 mi (8,907.77 km) |
| Walnut Creek to Olpe | 5,585.09 mi (8,988.33 km) |
| Walnut Creek to Olsberg | 5,584.04 mi (8,986.64 km) |
| Walnut Creek to Oranienburg | 5,623.49 mi (9,050.14 km) |
| Walnut Creek to Ortenberg | 5,653.85 mi (9,098.99 km) |
