| Horn-Bad Meinberg to Navodari | 1,041.47 mi (1,676.08 km) |
| Horn-Bad Meinberg to Negresti-Oas | 699.39 mi (1,125.56 km) |
| Horn-Bad Meinberg to Nehoiu | 908.15 mi (1,461.53 km) |
| Horn-Bad Meinberg to Ocna Mures | 770.79 mi (1,240.47 km) |
| Horn-Bad Meinberg to Odobesti | 922.02 mi (1,483.85 km) |
| Horn-Bad Meinberg to Odorheiu Secuiesc | 830.61 mi (1,336.74 km) |
| Horn-Bad Meinberg to Oltenita | 974.77 mi (1,568.74 km) |
| Horn-Bad Meinberg to Onesti | 891.51 mi (1,434.75 km) |
| Horn-Bad Meinberg to Oradea | 668.48 mi (1,075.81 km) |
| Horn-Bad Meinberg to Orastie | 767.55 mi (1,235.26 km) |
| Horn-Bad Meinberg to Oravita | 748.59 mi (1,204.74 km) |
| Horn-Bad Meinberg to Orsova | 788.79 mi (1,269.44 km) |
| Horn-Bad Meinberg to Otelu Rosu | 750.44 mi (1,207.72 km) |
| Horn-Bad Meinberg to Otopeni | 932.81 mi (1,501.21 km) |
| Horn-Bad Meinberg to Ovidiu | 1,041.50 mi (1,676.13 km) |
