| Herndon to Petersburg (Virginia) | 121.99 mi (196.33 km) |
| Herndon to Pflugerville (Texas) | 1,286.19 mi (2,069.92 km) |
| Herndon to Pharr (Texas) | 1,493.77 mi (2,403.99 km) |
| Herndon to Phelan (California) | 2,227.21 mi (3,584.36 km) |
| Herndon to Phenix City (Alabama) | 620.84 mi (999.14 km) |
| Herndon to Philadelphia (Pennsylvania) | 139.89 mi (225.13 km) |
| Herndon to Phillipsburg (New Jersey) | 166.72 mi (268.31 km) |
| Herndon to Phoenix (Arizona) | 1,956.51 mi (3,148.70 km) |
| Herndon to Phoenixville (Pennsylvania) | 127.97 mi (205.95 km) |
| Herndon to Picayune (Mississippi) | 907.50 mi (1,460.48 km) |
| Herndon to Pickerington (Ohio) | 294.07 mi (473.25 km) |
| Herndon to Pico Rivera (California) | 2,268.24 mi (3,650.38 km) |
| Herndon to Piedmont (California) | 2,404.74 mi (3,870.05 km) |
| Herndon to Pierre (South Dakota) | 1,236.35 mi (1,989.71 km) |
| Herndon to Pike Creek Valley (Delaware) | 104.33 mi (167.91 km) |
