| Romeoville to Petaluma (California) | 1,831.71 mi (2,947.85 km) |
| Romeoville to Petersburg (Virginia) | 647.62 mi (1,042.24 km) |
| Romeoville to Pflugerville (Texas) | 935.95 mi (1,506.27 km) |
| Romeoville to Pharr (Texas) | 1,212.97 mi (1,952.09 km) |
| Romeoville to Phelan (California) | 1,667.29 mi (2,683.24 km) |
| Romeoville to Phenix City (Alabama) | 655.97 mi (1,055.68 km) |
| Romeoville to Philadelphia (Pennsylvania) | 686.49 mi (1,104.80 km) |
| Romeoville to Phillipsburg (New Jersey) | 674.46 mi (1,085.43 km) |
| Romeoville to Phoenix (Arizona) | 1,420.28 mi (2,285.72 km) |
| Romeoville to Phoenixville (Pennsylvania) | 664.58 mi (1,069.54 km) |
| Romeoville to Picayune (Mississippi) | 771.88 mi (1,242.22 km) |
| Romeoville to Pickerington (Ohio) | 303.84 mi (488.99 km) |
| Romeoville to Pico Rivera (California) | 1,709.98 mi (2,751.95 km) |
| Romeoville to Piedmont (California) | 1,820.60 mi (2,929.96 km) |
| Romeoville to Pierre (South Dakota) | 645.21 mi (1,038.36 km) |
