| Harrow to Nasaud | 1,145.11 mi (1,842.87 km) |
| Harrow to Navodari | 1,419.59 mi (2,284.61 km) |
| Harrow to Negresti-Oas | 1,087.01 mi (1,749.37 km) |
| Harrow to Nehoiu | 1,285.99 mi (2,069.61 km) |
| Harrow to Ocna Mures | 1,148.50 mi (1,848.33 km) |
| Harrow to Odobesti | 1,304.73 mi (2,099.76 km) |
| Harrow to Odorheiu Secuiesc | 1,212.18 mi (1,950.81 km) |
| Harrow to Oltenita | 1,344.66 mi (2,164.03 km) |
| Harrow to Onesti | 1,276.47 mi (2,054.28 km) |
| Harrow to Oradea | 1,045.30 mi (1,682.25 km) |
| Harrow to Orastie | 1,138.08 mi (1,831.57 km) |
| Harrow to Oravita | 1,103.16 mi (1,775.37 km) |
| Harrow to Orsova | 1,144.21 mi (1,841.42 km) |
| Harrow to Otelu Rosu | 1,113.82 mi (1,792.53 km) |
| Harrow to Otopeni | 1,304.00 mi (2,098.58 km) |
