| Groslay to Navodari | 1,279.76 mi (2,059.58 km) |
| Groslay to Negresti-Oas | 966.41 mi (1,555.28 km) |
| Groslay to Nehoiu | 1,147.96 mi (1,847.47 km) |
| Groslay to Ocna Mures | 1,013.10 mi (1,630.42 km) |
| Groslay to Odobesti | 1,172.43 mi (1,886.84 km) |
| Groslay to Odorheiu Secuiesc | 1,080.08 mi (1,738.21 km) |
| Groslay to Oltenita | 1,197.32 mi (1,926.90 km) |
| Groslay to Onesti | 1,147.81 mi (1,847.22 km) |
| Groslay to Oradea | 911.57 mi (1,467.03 km) |
| Groslay to Orastie | 995.42 mi (1,601.97 km) |
| Groslay to Oravita | 948.07 mi (1,525.77 km) |
| Groslay to Orsova | 988.72 mi (1,591.18 km) |
| Groslay to Otelu Rosu | 965.34 mi (1,553.57 km) |
| Groslay to Otopeni | 1,158.59 mi (1,864.57 km) |
| Groslay to Ovidiu | 1,278.79 mi (2,058.01 km) |
