| Herndon to Point Pleasant (New Jersey) | 192.59 mi (309.94 km) |
| Herndon to Pomona (California) | 2,249.10 mi (3,619.57 km) |
| Herndon to Pompano Beach (Florida) | 893.62 mi (1,438.14 km) |
| Herndon to Pompton Lakes (New Jersey) | 216.00 mi (347.62 km) |
| Herndon to Pompton Plains (New Jersey) | 213.62 mi (343.78 km) |
| Herndon to Ponca City (Oklahoma) | 1,082.78 mi (1,742.57 km) |
| Herndon to Ponce (Puerto Rico) | 1,585.80 mi (2,552.10 km) |
| Herndon to Pontiac (Illinois) | 610.38 mi (982.31 km) |
| Herndon to Pontiac (Michigan) | 399.65 mi (643.18 km) |
| Herndon to Pooler (Georgia) | 521.75 mi (839.68 km) |
| Herndon to Poplar Bluff (Missouri) | 726.04 mi (1,168.44 km) |
| Herndon to Poquoson (Virginia) | 138.81 mi (223.39 km) |
| Herndon to Port Angeles (Washington) | 2,354.11 mi (3,788.58 km) |
| Herndon to Port Arthur (Texas) | 1,130.89 mi (1,820.00 km) |
| Herndon to Port Charlotte (Florida) | 871.42 mi (1,402.41 km) |
