| Boulder City to Nasaud | 6,166.60 mi (9,924.19 km) |
| Boulder City to Navodari | 6,445.54 mi (10,373.09 km) |
| Boulder City to Negresti-Oas | 6,107.92 mi (9,829.74 km) |
| Boulder City to Nehoiu | 6,327.59 mi (10,183.27 km) |
| Boulder City to Ocna Mures | 6,205.17 mi (9,986.25 km) |
| Boulder City to Odobesti | 6,321.46 mi (10,173.40 km) |
| Boulder City to Odorheiu Secuiesc | 6,245.83 mi (10,051.69 km) |
| Boulder City to Oltenita | 6,411.30 mi (10,317.98 km) |
| Boulder City to Onesti | 6,284.89 mi (10,114.56 km) |
| Boulder City to Oradea | 6,115.64 mi (9,842.18 km) |
| Boulder City to Orastie | 6,219.63 mi (10,009.53 km) |
| Boulder City to Oravita | 6,226.08 mi (10,019.90 km) |
| Boulder City to Orsova | 6,263.46 mi (10,080.06 km) |
| Boulder City to Otelu Rosu | 6,216.51 mi (10,004.51 km) |
| Boulder City to Otopeni | 6,369.50 mi (10,250.71 km) |
