| Herndon to Somersworth (New Hampshire) | 449.33 mi (723.13 km) |
| Herndon to Somerton (Arizona) | 2,121.74 mi (3,414.60 km) |
| Herndon to Somerville (Massachusetts) | 405.19 mi (652.09 km) |
| Herndon to Somerville (New Jersey) | 184.30 mi (296.61 km) |
| Herndon to Sonoma (California) | 2,407.93 mi (3,875.18 km) |
| Herndon to Soquel (California) | 2,406.27 mi (3,872.52 km) |
| Herndon to South Bend (Indiana) | 503.61 mi (810.48 km) |
| Herndon to South Bradenton (Florida) | 849.58 mi (1,367.26 km) |
| Herndon to South Burlington (Vermont) | 435.95 mi (701.60 km) |
| Herndon to South Charleston (West Virginia) | 237.53 mi (382.26 km) |
| Herndon to South Daytona (Florida) | 708.18 mi (1,139.71 km) |
| Herndon to South El Monte (California) | 2,264.63 mi (3,644.57 km) |
| Herndon to South Elgin (Illinois) | 610.46 mi (982.44 km) |
| Herndon to South Euclid (Ohio) | 280.58 mi (451.55 km) |
| Herndon to South Farmingdale (New York) | 241.32 mi (388.37 km) |
