| Ukiah to Oerlinghausen | 5,508.82 mi (8,865.59 km) |
| Ukiah to Oestrich-Winkel | 5,601.59 mi (9,014.89 km) |
| Ukiah to Offenburg | 5,685.36 mi (9,149.70 km) |
| Ukiah to Oftersheim | 5,652.14 mi (9,096.24 km) |
| Ukiah to Ohrdruf | 5,624.41 mi (9,051.62 km) |
| Ukiah to Ohringen | 5,685.65 mi (9,150.17 km) |
| Ukiah to Olbernhau | 5,696.41 mi (9,167.49 km) |
| Ukiah to Olching | 5,789.49 mi (9,317.28 km) |
| Ukiah to Oldenburg | 5,431.93 mi (8,741.84 km) |
| Ukiah to Oldenburg in Holstein | 5,430.29 mi (8,739.21 km) |
| Ukiah to Olfen | 5,490.24 mi (8,835.69 km) |
| Ukiah to Olpe | 5,540.64 mi (8,916.80 km) |
| Ukiah to Olsberg | 5,538.69 mi (8,913.66 km) |
| Ukiah to Oranienburg | 5,572.76 mi (8,968.49 km) |
| Ukiah to Ortenberg | 5,609.01 mi (9,026.84 km) |
