| Romeoville to San Luis Obispo (California) | 1,804.77 mi (2,904.50 km) |
| Romeoville to San Marcos (California) | 1,690.94 mi (2,721.30 km) |
| Romeoville to San Marcos (Texas) | 980.42 mi (1,577.83 km) |
| Romeoville to San Marino (California) | 1,707.12 mi (2,747.35 km) |
| Romeoville to San Mateo (California) | 1,831.02 mi (2,946.75 km) |
| Romeoville to San Pablo (California) | 1,823.24 mi (2,934.22 km) |
| Romeoville to San Rafael (California) | 1,831.87 mi (2,948.12 km) |
| Romeoville to San Ramon (California) | 1,806.82 mi (2,907.79 km) |
| Romeoville to San Tan Valley (Arizona) | 1,408.04 mi (2,266.01 km) |
| Romeoville to Sand Springs (Oklahoma) | 574.58 mi (924.70 km) |
| Romeoville to Sandusky (Ohio) | 279.38 mi (449.61 km) |
| Romeoville to Sandy (Oregon) | 1,718.56 mi (2,765.75 km) |
| Romeoville to Sandy (Utah) | 1,234.85 mi (1,987.30 km) |
| Romeoville to Sandy Springs (Georgia) | 569.19 mi (916.03 km) |
| Romeoville to Sanford (Florida) | 966.52 mi (1,555.47 km) |
