| Darby to Portage (Michigan) | 560.30 mi (901.71 km) |
| Darby to Portage (Wisconsin) | 772.92 mi (1,243.90 km) |
| Darby to Portales (New Mexico) | 1,592.14 mi (2,562.30 km) |
| Darby to Porterville (California) | 2,374.50 mi (3,821.38 km) |
| Darby to Portland (Maine) | 365.11 mi (587.59 km) |
| Darby to Portland (Oregon) | 2,400.65 mi (3,863.48 km) |
| Darby to Portland (Tennessee) | 652.34 mi (1,049.84 km) |
| Darby to Portland (Texas) | 1,507.18 mi (2,425.57 km) |
| Darby to Portsmouth (New Hampshire) | 317.25 mi (510.56 km) |
| Darby to Portsmouth (Ohio) | 418.30 mi (673.19 km) |
| Darby to Portsmouth (Virginia) | 220.50 mi (354.85 km) |
| Darby to Post Falls (Idaho) | 2,118.76 mi (3,409.81 km) |
| Darby to Potomac (Maryland) | 120.66 mi (194.19 km) |
| Darby to Potomac Park (California) | 2,387.79 mi (3,842.77 km) |
| Darby to Pottstown (Pennsylvania) | 30.50 mi (49.08 km) |
