| Herndon to Smyrna (Delaware) | 97.90 mi (157.55 km) |
| Herndon to Smyrna (Georgia) | 530.39 mi (853.57 km) |
| Herndon to Smyrna (Tennessee) | 542.08 mi (872.39 km) |
| Herndon to Snellville (Georgia) | 509.83 mi (820.48 km) |
| Herndon to Snoqualmie (Washington) | 2,280.44 mi (3,670.01 km) |
| Herndon to Snyder (Texas) | 1,382.07 mi (2,224.23 km) |
| Herndon to Socastee (South Carolina) | 375.99 mi (605.09 km) |
| Herndon to Socorro (Texas) | 1,696.81 mi (2,730.75 km) |
| Herndon to Soddy-Daisy (Tennessee) | 499.62 mi (804.06 km) |
| Herndon to Solana Beach (California) | 2,248.77 mi (3,619.05 km) |
| Herndon to Soledad (California) | 2,385.81 mi (3,839.59 km) |
| Herndon to Solon (Ohio) | 271.36 mi (436.71 km) |
| Herndon to Somers Point (New Jersey) | 150.88 mi (242.83 km) |
| Herndon to Somerset (Kentucky) | 414.09 mi (666.41 km) |
| Herndon to Somerset (New Jersey) | 186.54 mi (300.21 km) |
