| Castleton to Nasaud | 1,239.40 mi (1,994.63 km) |
| Castleton to Navodari | 1,520.95 mi (2,447.74 km) |
| Castleton to Negresti-Oas | 1,179.54 mi (1,898.29 km) |
| Castleton to Nehoiu | 1,387.44 mi (2,232.87 km) |
| Castleton to Ocna Mures | 1,249.85 mi (2,011.43 km) |
| Castleton to Odobesti | 1,402.10 mi (2,256.47 km) |
| Castleton to Odorheiu Secuiesc | 1,310.50 mi (2,109.05 km) |
| Castleton to Oltenita | 1,451.83 mi (2,336.50 km) |
| Castleton to Onesti | 1,371.71 mi (2,207.55 km) |
| Castleton to Oradea | 1,147.08 mi (1,846.04 km) |
| Castleton to Orastie | 1,244.34 mi (2,002.57 km) |
| Castleton to Oravita | 1,217.96 mi (1,960.11 km) |
| Castleton to Orsova | 1,258.80 mi (2,025.84 km) |
| Castleton to Otelu Rosu | 1,224.19 mi (1,970.14 km) |
| Castleton to Otopeni | 1,410.24 mi (2,269.56 km) |
