| Birkenau to Navodari | 1,002.74 mi (1,613.75 km) |
| Birkenau to Negresti-Oas | 679.92 mi (1,094.23 km) |
| Birkenau to Nehoiu | 869.60 mi (1,399.48 km) |
| Birkenau to Ocna Mures | 732.89 mi (1,179.48 km) |
| Birkenau to Odobesti | 891.08 mi (1,434.05 km) |
| Birkenau to Odorheiu Secuiesc | 798.38 mi (1,284.88 km) |
| Birkenau to Oltenita | 925.26 mi (1,489.07 km) |
| Birkenau to Onesti | 864.75 mi (1,391.67 km) |
| Birkenau to Oradea | 630.14 mi (1,014.10 km) |
| Birkenau to Orastie | 719.60 mi (1,158.08 km) |
| Birkenau to Oravita | 682.40 mi (1,098.22 km) |
| Birkenau to Orsova | 723.45 mi (1,164.28 km) |
| Birkenau to Otelu Rosu | 693.80 mi (1,116.56 km) |
| Birkenau to Otopeni | 885.04 mi (1,424.34 km) |
| Birkenau to Ovidiu | 1,002.09 mi (1,612.71 km) |
