| Herndon to South Plainfield (New Jersey) | 192.85 mi (310.36 km) |
| Herndon to South Portland (Maine) | 488.99 mi (786.95 km) |
| Herndon to South Riding (Virginia) | 7.89 mi (12.69 km) |
| Herndon to South River (New Jersey) | 189.63 mi (305.18 km) |
| Herndon to South Salt Lake (Utah) | 1,823.14 mi (2,934.07 km) |
| Herndon to South San Francisco (California) | 2,417.95 mi (3,891.31 km) |
| Herndon to South San Jose Hills (California) | 2,257.81 mi (3,633.60 km) |
| Herndon to South Sioux City (Nebraska) | 1,022.79 mi (1,646.02 km) |
| Herndon to South St. Paul (Minnesota) | 900.52 mi (1,449.25 km) |
| Herndon to South Valley (New Mexico) | 1,632.49 mi (2,627.24 km) |
| Herndon to South Venice (Florida) | 873.57 mi (1,405.87 km) |
| Herndon to South Whittier (California) | 2,266.54 mi (3,647.64 km) |
| Herndon to South Yarmouth (Massachusetts) | 421.82 mi (678.86 km) |
| Herndon to Southaven (Mississippi) | 747.75 mi (1,203.39 km) |
| Herndon to Southchase (Florida) | 766.86 mi (1,234.15 km) |
