| Potomac to Nasaud | 4,775.28 mi (7,685.07 km) |
| Potomac to Navodari | 5,060.25 mi (8,143.68 km) |
| Potomac to Negresti-Oas | 4,714.53 mi (7,587.31 km) |
| Potomac to Nehoiu | 4,927.21 mi (7,929.58 km) |
| Potomac to Ocna Mures | 4,790.00 mi (7,708.76 km) |
| Potomac to Odobesti | 4,939.24 mi (7,948.93 km) |
| Potomac to Odorheiu Secuiesc | 4,848.82 mi (7,803.43 km) |
| Potomac to Oltenita | 4,993.25 mi (8,035.86 km) |
| Potomac to Onesti | 4,907.29 mi (7,897.52 km) |
| Potomac to Oradea | 4,687.69 mi (7,544.11 km) |
| Potomac to Orastie | 4,785.77 mi (7,701.95 km) |
| Potomac to Oravita | 4,757.55 mi (7,656.54 km) |
| Potomac to Orsova | 4,798.55 mi (7,722.52 km) |
| Potomac to Otelu Rosu | 4,765.41 mi (7,669.19 km) |
| Potomac to Otopeni | 4,951.56 mi (7,968.76 km) |
