| Romeoville to Owosso (Michigan) | 221.48 mi (356.44 km) |
| Romeoville to Oxford (Alabama) | 568.38 mi (914.72 km) |
| Romeoville to Oxford (Mississippi) | 508.26 mi (817.96 km) |
| Romeoville to Oxford (Ohio) | 229.27 mi (368.97 km) |
| Romeoville to Oxnard (California) | 1,759.58 mi (2,831.76 km) |
| Romeoville to Oxon Hill (Maryland) | 618.57 mi (995.50 km) |
| Romeoville to Ozark (Alabama) | 716.40 mi (1,152.93 km) |
| Romeoville to Ozark (Missouri) | 418.83 mi (674.05 km) |
| Romeoville to Pace (Florida) | 762.69 mi (1,227.43 km) |
| Romeoville to Pacific Grove (California) | 1,833.68 mi (2,951.02 km) |
| Romeoville to Pacifica (California) | 1,838.22 mi (2,958.33 km) |
| Romeoville to Paducah (Kentucky) | 316.45 mi (509.28 km) |
| Romeoville to Pahrump (Nevada) | 1,538.02 mi (2,475.20 km) |
| Romeoville to Painesville (Ohio) | 353.26 mi (568.52 km) |
| Romeoville to Palatine (Illinois) | 33.72 mi (54.27 km) |
