| Romeoville to Nyon | 4,405.93 mi (7,090.67 km) |
| Romeoville to Oberriet | 4,499.15 mi (7,240.68 km) |
| Romeoville to Obersiggenthal | 4,443.52 mi (7,151.16 km) |
| Romeoville to Oberwil | 4,414.04 mi (7,103.71 km) |
| Romeoville to Oberwingert | 4,460.66 mi (7,178.74 km) |
| Romeoville to Oftringen | 4,435.69 mi (7,138.55 km) |
| Romeoville to Olten | 4,433.74 mi (7,135.42 km) |
| Romeoville to Onex | 4,408.34 mi (7,094.53 km) |
| Romeoville to Opfikon | 4,456.19 mi (7,171.54 km) |
| Romeoville to Ostermundigen | 4,433.18 mi (7,134.51 km) |
| Romeoville to Payerne | 4,416.81 mi (7,108.16 km) |
| Romeoville to Pfaffikon | 4,467.13 mi (7,189.15 km) |
| Romeoville to Plan-les-Ouates | 4,409.64 mi (7,096.63 km) |
| Romeoville to Pratteln | 4,419.53 mi (7,112.55 km) |
| Romeoville to Prilly | 4,414.65 mi (7,104.69 km) |
