| Mariestad to Orbetello | 1,129.08 mi (1,817.08 km) |
| Mariestad to Oria | 1,268.56 mi (2,041.54 km) |
| Mariestad to Oristano | 1,318.75 mi (2,122.32 km) |
| Mariestad to Orta Nova | 1,202.92 mi (1,935.91 km) |
| Mariestad to Orte | 1,123.74 mi (1,808.49 km) |
| Mariestad to Ortona | 1,129.96 mi (1,818.49 km) |
| Mariestad to Orvieto | 1,106.66 mi (1,781.00 km) |
| Mariestad to Orzinuovi | 933.24 mi (1,501.91 km) |
| Mariestad to Osimo | 1,051.47 mi (1,692.17 km) |
| Mariestad to Ospitaletto | 921.62 mi (1,483.21 km) |
| Mariestad to Ostuni | 1,252.25 mi (2,015.29 km) |
| Mariestad to Ottaviano | 1,233.65 mi (1,985.37 km) |
| Mariestad to Ovada | 995.72 mi (1,602.46 km) |
| Mariestad to Ozieri | 1,269.23 mi (2,042.63 km) |
| Mariestad to Paceco | 1,432.50 mi (2,305.39 km) |
