| Port Huron to Nasaud | 4,772.85 mi (7,681.16 km) |
| Port Huron to Navodari | 5,060.54 mi (8,144.15 km) |
| Port Huron to Negresti-Oas | 4,711.72 mi (7,582.78 km) |
| Port Huron to Nehoiu | 4,929.55 mi (7,933.35 km) |
| Port Huron to Ocna Mures | 4,794.31 mi (7,715.69 km) |
| Port Huron to Odobesti | 4,936.87 mi (7,945.13 km) |
| Port Huron to Odorheiu Secuiesc | 4,849.06 mi (7,803.81 km) |
| Port Huron to Oltenita | 5,001.37 mi (8,048.93 km) |
| Port Huron to Onesti | 4,903.20 mi (7,890.94 km) |
| Port Huron to Oradea | 4,693.98 mi (7,554.24 km) |
| Port Huron to Orastie | 4,795.17 mi (7,717.09 km) |
| Port Huron to Oravita | 4,776.29 mi (7,686.69 km) |
| Port Huron to Orsova | 4,816.85 mi (7,751.97 km) |
| Port Huron to Otelu Rosu | 4,779.33 mi (7,691.60 km) |
| Port Huron to Otopeni | 4,959.03 mi (7,980.79 km) |
