| Diemen to Navodari | 1,211.57 mi (1,949.84 km) |
| Diemen to Negresti-Oas | 871.24 mi (1,402.13 km) |
| Diemen to Nehoiu | 1,078.03 mi (1,734.92 km) |
| Diemen to Ocna Mures | 940.41 mi (1,513.45 km) |
| Diemen to Odobesti | 1,093.08 mi (1,759.15 km) |
| Diemen to Odorheiu Secuiesc | 1,001.31 mi (1,611.46 km) |
| Diemen to Oltenita | 1,142.55 mi (1,838.75 km) |
| Diemen to Onesti | 1,063.02 mi (1,710.77 km) |
| Diemen to Oradea | 837.62 mi (1,348.03 km) |
| Diemen to Orastie | 935.06 mi (1,504.84 km) |
| Diemen to Oravita | 910.66 mi (1,465.56 km) |
| Diemen to Orsova | 951.34 mi (1,531.03 km) |
| Diemen to Otelu Rosu | 915.58 mi (1,473.49 km) |
| Diemen to Otopeni | 1,100.89 mi (1,771.71 km) |
| Diemen to Ovidiu | 1,211.49 mi (1,949.70 km) |
