| Grinon to Nasaud | 1,482.72 mi (2,386.21 km) |
| Grinon to Navodari | 1,672.58 mi (2,691.76 km) |
| Grinon to Negresti-Oas | 1,444.72 mi (2,325.06 km) |
| Grinon to Nehoiu | 1,559.92 mi (2,510.45 km) |
| Grinon to Ocna Mures | 1,448.58 mi (2,331.26 km) |
| Grinon to Odobesti | 1,598.02 mi (2,571.77 km) |
| Grinon to Odorheiu Secuiesc | 1,516.33 mi (2,440.30 km) |
| Grinon to Oltenita | 1,575.06 mi (2,534.81 km) |
| Grinon to Onesti | 1,585.83 mi (2,552.14 km) |
| Grinon to Oradea | 1,365.22 mi (2,197.10 km) |
| Grinon to Orastie | 1,412.84 mi (2,273.75 km) |
| Grinon to Oravita | 1,334.08 mi (2,146.99 km) |
| Grinon to Orsova | 1,366.98 mi (2,199.95 km) |
| Grinon to Otelu Rosu | 1,369.70 mi (2,204.33 km) |
| Grinon to Otopeni | 1,546.97 mi (2,489.61 km) |
