| Opmeer to Marghita | 852.70 mi (1,372.28 km) |
| Opmeer to Marginea | 978.00 mi (1,573.94 km) |
| Opmeer to Matca | 1,116.43 mi (1,796.72 km) |
| Opmeer to Medgidia | 1,209.21 mi (1,946.03 km) |
| Opmeer to Media | 978.03 mi (1,573.99 km) |
| Opmeer to Miercurea-Ciuc | 1,027.70 mi (1,653.93 km) |
| Opmeer to Mioveni | 1,049.79 mi (1,689.47 km) |
| Opmeer to Mizil | 1,106.48 mi (1,780.71 km) |
| Opmeer to Moinesti | 1,052.36 mi (1,693.61 km) |
| Opmeer to Moisei | 930.47 mi (1,497.44 km) |
| Opmeer to Moldova Noua | 937.00 mi (1,507.95 km) |
| Opmeer to Moreni | 1,076.12 mi (1,731.85 km) |
| Opmeer to Motru | 981.44 mi (1,579.47 km) |
| Opmeer to Murfatlar | 1,218.21 mi (1,960.51 km) |
| Opmeer to Nasaud | 938.02 mi (1,509.60 km) |
