| Porsgrunn to Oak Harbor (Washington) | 4,542.91 mi (7,311.10 km) |
| Porsgrunn to Oak Hills (Oregon) | 4,720.50 mi (7,596.91 km) |
| Porsgrunn to Oak Lawn (Illinois) | 4,047.56 mi (6,513.92 km) |
| Porsgrunn to Oak Park (California) | 5,348.41 mi (8,607.44 km) |
| Porsgrunn to Oak Park (Illinois) | 4,039.09 mi (6,500.29 km) |
| Porsgrunn to Oak Park (Michigan) | 3,863.94 mi (6,218.41 km) |
| Porsgrunn to Oak Ridge (Florida) | 4,588.15 mi (7,383.92 km) |
| Porsgrunn to Oak Ridge (New Jersey) | 3,658.65 mi (5,888.02 km) |
| Porsgrunn to Oak Ridge (Tennessee) | 4,258.98 mi (6,854.17 km) |
| Porsgrunn to Oakdale (California) | 5,170.21 mi (8,320.65 km) |
| Porsgrunn to Oakdale (Minnesota) | 4,020.76 mi (6,470.78 km) |
| Porsgrunn to Oakland (California) | 5,198.28 mi (8,365.83 km) |
| Porsgrunn to Oakland (New Jersey) | 3,650.15 mi (5,874.35 km) |
| Porsgrunn to Oakland Park (Florida) | 4,676.53 mi (7,526.15 km) |
| Porsgrunn to Oakleaf Plantation (Florida) | 4,505.39 mi (7,250.72 km) |
