| San Marcos to Oerlinghausen | 5,708.50 mi (9,186.95 km) |
| San Marcos to Oestrich-Winkel | 5,787.40 mi (9,313.92 km) |
| San Marcos to Offenburg | 5,862.20 mi (9,434.29 km) |
| San Marcos to Oftersheim | 5,836.98 mi (9,393.71 km) |
| San Marcos to Ohrdruf | 5,826.65 mi (9,377.08 km) |
| San Marcos to Ohringen | 5,873.62 mi (9,452.68 km) |
| San Marcos to Olbernhau | 5,909.16 mi (9,509.87 km) |
| San Marcos to Olching | 5,980.32 mi (9,624.40 km) |
| San Marcos to Oldenburg | 5,636.35 mi (9,070.83 km) |
| San Marcos to Oldenburg in Holstein | 5,651.68 mi (9,095.50 km) |
| San Marcos to Olfen | 5,683.18 mi (9,146.20 km) |
| San Marcos to Olpe | 5,731.49 mi (9,223.94 km) |
| San Marcos to Olsberg | 5,734.16 mi (9,228.24 km) |
| San Marcos to Oranienburg | 5,795.67 mi (9,327.23 km) |
| San Marcos to Ortenberg | 5,801.40 mi (9,336.45 km) |
