| Arouca to Navodari | 1,872.35 mi (3,013.26 km) |
| Arouca to Negresti-Oas | 1,622.11 mi (2,610.53 km) |
| Arouca to Nehoiu | 1,754.42 mi (2,823.47 km) |
| Arouca to Ocna Mures | 1,636.32 mi (2,633.40 km) |
| Arouca to Odobesti | 1,790.15 mi (2,880.97 km) |
| Arouca to Odorheiu Secuiesc | 1,704.97 mi (2,743.88 km) |
| Arouca to Oltenita | 1,776.47 mi (2,858.95 km) |
| Arouca to Onesti | 1,775.05 mi (2,856.67 km) |
| Arouca to Oradea | 1,547.28 mi (2,490.11 km) |
| Arouca to Orastie | 1,603.90 mi (2,581.22 km) |
| Arouca to Oravita | 1,530.01 mi (2,462.31 km) |
| Arouca to Orsova | 1,565.02 mi (2,518.66 km) |
| Arouca to Otelu Rosu | 1,562.68 mi (2,514.89 km) |
| Arouca to Otopeni | 1,745.99 mi (2,809.90 km) |
| Arouca to Ovidiu | 1,870.09 mi (3,009.62 km) |
