| Frederick to Nasaud | 4,763.28 mi (7,665.75 km) |
| Frederick to Navodari | 5,048.55 mi (8,124.86 km) |
| Frederick to Negresti-Oas | 4,702.48 mi (7,567.90 km) |
| Frederick to Nehoiu | 4,915.62 mi (7,910.93 km) |
| Frederick to Ocna Mures | 4,778.51 mi (7,690.27 km) |
| Frederick to Odobesti | 4,927.30 mi (7,929.72 km) |
| Frederick to Odorheiu Secuiesc | 4,837.04 mi (7,784.47 km) |
| Frederick to Oltenita | 4,982.12 mi (8,017.95 km) |
| Frederick to Onesti | 4,895.21 mi (7,878.08 km) |
| Frederick to Oradea | 4,676.31 mi (7,525.79 km) |
| Frederick to Orastie | 4,774.66 mi (7,684.07 km) |
| Frederick to Oravita | 4,747.14 mi (7,639.79 km) |
| Frederick to Orsova | 4,788.12 mi (7,705.73 km) |
| Frederick to Otelu Rosu | 4,754.64 mi (7,651.85 km) |
| Frederick to Otopeni | 4,940.36 mi (7,950.74 km) |
