| Opatija to Oak Harbor (Washington) | 5,464.38 mi (8,794.07 km) |
| Opatija to Oak Hills (Oregon) | 5,635.56 mi (9,069.55 km) |
| Opatija to Oak Lawn (Illinois) | 4,744.93 mi (7,636.23 km) |
| Opatija to Oak Park (California) | 6,208.47 mi (9,991.56 km) |
| Opatija to Oak Park (Illinois) | 4,738.27 mi (7,625.50 km) |
| Opatija to Oak Park (Michigan) | 4,534.57 mi (7,297.68 km) |
| Opatija to Oak Ridge (Florida) | 5,105.21 mi (8,216.04 km) |
| Opatija to Oak Ridge (New Jersey) | 4,245.32 mi (6,832.17 km) |
| Opatija to Oak Ridge (Tennessee) | 4,875.92 mi (7,847.04 km) |
| Opatija to Oakdale (California) | 6,053.87 mi (9,742.76 km) |
| Opatija to Oakdale (Minnesota) | 4,780.71 mi (7,693.80 km) |
| Opatija to Oakland (California) | 6,088.81 mi (9,799.00 km) |
| Opatija to Oakland (New Jersey) | 4,234.66 mi (6,815.03 km) |
| Opatija to Oakland Park (Florida) | 5,157.56 mi (8,300.28 km) |
| Opatija to Oakleaf Plantation (Florida) | 5,043.36 mi (8,116.51 km) |
