| Port Huron to Nyon | 4,121.44 mi (6,632.81 km) |
| Port Huron to Oberriet | 4,219.16 mi (6,790.09 km) |
| Port Huron to Obersiggenthal | 4,162.76 mi (6,699.31 km) |
| Port Huron to Oberwil | 4,132.70 mi (6,650.94 km) |
| Port Huron to Oberwingert | 4,180.36 mi (6,727.64 km) |
| Port Huron to Oftringen | 4,154.28 mi (6,685.66 km) |
| Port Huron to Olten | 4,152.38 mi (6,682.61 km) |
| Port Huron to Onex | 4,123.38 mi (6,635.94 km) |
| Port Huron to Opfikon | 4,175.55 mi (6,719.90 km) |
| Port Huron to Ostermundigen | 4,150.74 mi (6,679.97 km) |
| Port Huron to Payerne | 4,133.65 mi (6,652.47 km) |
| Port Huron to Pfaffikon | 4,186.56 mi (6,737.62 km) |
| Port Huron to Plan-les-Ouates | 4,124.67 mi (6,638.01 km) |
| Port Huron to Pratteln | 4,138.32 mi (6,659.99 km) |
| Port Huron to Prilly | 4,130.71 mi (6,647.73 km) |
