| Herndon to Pell City (Alabama) | 619.48 mi (996.95 km) |
| Herndon to Pella (Iowa) | 835.71 mi (1,344.94 km) |
| Herndon to Pembroke Pines (Florida) | 911.47 mi (1,466.87 km) |
| Herndon to Pendleton (Oregon) | 2,141.64 mi (3,446.63 km) |
| Herndon to Pensacola (Florida) | 809.77 mi (1,303.20 km) |
| Herndon to Peoria (Arizona) | 1,962.55 mi (3,158.42 km) |
| Herndon to Peoria (Illinois) | 659.57 mi (1,061.48 km) |
| Herndon to Perris (California) | 2,226.77 mi (3,583.64 km) |
| Herndon to Perry (Georgia) | 572.47 mi (921.30 km) |
| Herndon to Perry Hall (Maryland) | 57.27 mi (92.16 km) |
| Herndon to Perrysburg (Ohio) | 374.37 mi (602.49 km) |
| Herndon to Perth Amboy (New Jersey) | 197.08 mi (317.16 km) |
| Herndon to Peru (Indiana) | 476.87 mi (767.44 km) |
| Herndon to Petal (Mississippi) | 850.40 mi (1,368.59 km) |
| Herndon to Petaluma (California) | 2,417.53 mi (3,890.64 km) |
