| Clayton to Nasaud | 1,227.25 mi (1,975.07 km) |
| Clayton to Navodari | 1,509.50 mi (2,429.30 km) |
| Clayton to Negresti-Oas | 1,167.23 mi (1,878.48 km) |
| Clayton to Nehoiu | 1,376.07 mi (2,214.57 km) |
| Clayton to Ocna Mures | 1,238.56 mi (1,993.27 km) |
| Clayton to Odobesti | 1,390.21 mi (2,237.33 km) |
| Clayton to Odorheiu Secuiesc | 1,298.79 mi (2,090.20 km) |
| Clayton to Oltenita | 1,441.19 mi (2,319.36 km) |
| Clayton to Onesti | 1,359.57 mi (2,188.02 km) |
| Clayton to Oradea | 1,135.93 mi (1,828.11 km) |
| Clayton to Orastie | 1,233.71 mi (1,985.46 km) |
| Clayton to Oravita | 1,208.58 mi (1,945.02 km) |
| Clayton to Orsova | 1,249.36 mi (2,010.65 km) |
| Clayton to Otelu Rosu | 1,214.15 mi (1,953.98 km) |
| Clayton to Otopeni | 1,399.49 mi (2,252.26 km) |
