| Madrid to Oerlinghausen | 990.51 mi (1,594.07 km) |
| Madrid to Oestrich-Winkel | 871.40 mi (1,402.38 km) |
| Madrid to Offenburg | 797.62 mi (1,283.64 km) |
| Madrid to Oftersheim | 860.72 mi (1,385.20 km) |
| Madrid to Ohrdruf | 998.61 mi (1,607.11 km) |
| Madrid to Ohringen | 884.87 mi (1,424.05 km) |
| Madrid to Olbernhau | 1,082.22 mi (1,741.67 km) |
| Madrid to Olching | 914.25 mi (1,471.35 km) |
| Madrid to Oldenburg | 1,041.55 mi (1,676.21 km) |
| Madrid to Oldenburg in Holstein | 1,172.38 mi (1,886.77 km) |
| Madrid to Olfen | 942.17 mi (1,516.27 km) |
| Madrid to Olpe | 917.55 mi (1,476.65 km) |
| Madrid to Olsberg | 953.49 mi (1,534.50 km) |
| Madrid to Oranienburg | 1,166.34 mi (1,877.04 km) |
| Madrid to Ortenberg | 922.04 mi (1,483.87 km) |
