| Elkridge to Oerlinghausen | 3,979.09 mi (6,403.73 km) |
| Elkridge to Oestrich-Winkel | 4,008.22 mi (6,450.60 km) |
| Elkridge to Offenburg | 4,050.12 mi (6,518.04 km) |
| Elkridge to Oftersheim | 4,050.21 mi (6,518.19 km) |
| Elkridge to Ohrdruf | 4,092.90 mi (6,586.89 km) |
| Elkridge to Ohringen | 4,092.52 mi (6,586.27 km) |
| Elkridge to Olbernhau | 4,199.59 mi (6,758.59 km) |
| Elkridge to Olching | 4,197.54 mi (6,755.28 km) |
| Elkridge to Oldenburg | 3,929.45 mi (6,323.84 km) |
| Elkridge to Oldenburg in Holstein | 3,998.03 mi (6,434.20 km) |
| Elkridge to Olfen | 3,935.71 mi (6,333.91 km) |
| Elkridge to Olpe | 3,972.78 mi (6,393.57 km) |
| Elkridge to Olsberg | 3,989.17 mi (6,419.95 km) |
| Elkridge to Oranienburg | 4,130.82 mi (6,647.92 km) |
| Elkridge to Ortenberg | 4,040.35 mi (6,502.31 km) |
