| Fountain Valley to Oerlinghausen | 5,696.56 mi (9,167.73 km) |
| Fountain Valley to Oestrich-Winkel | 5,777.16 mi (9,297.44 km) |
| Fountain Valley to Offenburg | 5,853.07 mi (9,419.61 km) |
| Fountain Valley to Oftersheim | 5,826.89 mi (9,377.48 km) |
| Fountain Valley to Ohrdruf | 5,814.50 mi (9,357.53 km) |
| Fountain Valley to Ohringen | 5,863.20 mi (9,435.91 km) |
| Fountain Valley to Olbernhau | 5,895.83 mi (9,488.42 km) |
| Fountain Valley to Olching | 5,969.65 mi (9,607.22 km) |
| Fountain Valley to Oldenburg | 5,623.78 mi (9,050.60 km) |
| Fountain Valley to Oldenburg in Holstein | 5,637.11 mi (9,072.05 km) |
| Fountain Valley to Olfen | 5,672.01 mi (9,128.23 km) |
| Fountain Valley to Olpe | 5,720.61 mi (9,206.43 km) |
| Fountain Valley to Olsberg | 5,722.74 mi (9,209.85 km) |
| Fountain Valley to Oranienburg | 5,781.04 mi (9,303.68 km) |
| Fountain Valley to Ortenberg | 5,790.40 mi (9,318.74 km) |
