| Rockville to Nasaud | 4,770.43 mi (7,677.26 km) |
| Rockville to Navodari | 5,055.42 mi (8,135.91 km) |
| Rockville to Negresti-Oas | 4,709.68 mi (7,579.49 km) |
| Rockville to Nehoiu | 4,922.39 mi (7,921.82 km) |
| Rockville to Ocna Mures | 4,785.18 mi (7,701.01 km) |
| Rockville to Odobesti | 4,934.39 mi (7,941.13 km) |
| Rockville to Odorheiu Secuiesc | 4,843.98 mi (7,795.64 km) |
| Rockville to Oltenita | 4,988.46 mi (8,028.15 km) |
| Rockville to Onesti | 4,902.43 mi (7,889.70 km) |
| Rockville to Oradea | 4,682.88 mi (7,536.37 km) |
| Rockville to Orastie | 4,780.98 mi (7,694.24 km) |
| Rockville to Oravita | 4,752.81 mi (7,648.91 km) |
| Rockville to Orsova | 4,793.81 mi (7,714.89 km) |
| Rockville to Otelu Rosu | 4,760.64 mi (7,661.51 km) |
| Rockville to Otopeni | 4,946.76 mi (7,961.04 km) |
