| Morriston to Oerlinghausen | 538.15 mi (866.07 km) |
| Morriston to Oestrich-Winkel | 532.89 mi (857.61 km) |
| Morriston to Offenburg | 570.19 mi (917.63 km) |
| Morriston to Oftersheim | 571.75 mi (920.14 km) |
| Morriston to Ohrdruf | 636.10 mi (1,023.71 km) |
| Morriston to Ohringen | 614.48 mi (988.92 km) |
| Morriston to Olbernhau | 749.74 mi (1,206.59 km) |
| Morriston to Olching | 717.86 mi (1,155.29 km) |
| Morriston to Oldenburg | 521.69 mi (839.59 km) |
| Morriston to Oldenburg in Holstein | 641.52 mi (1,032.43 km) |
| Morriston to Olfen | 484.47 mi (779.68 km) |
| Morriston to Olpe | 509.52 mi (819.99 km) |
| Morriston to Olsberg | 534.01 mi (859.41 km) |
| Morriston to Oranienburg | 729.33 mi (1,173.74 km) |
| Morriston to Ortenberg | 571.29 mi (919.40 km) |
