| Herndon to Cadillac (Michigan) | 551.90 mi (888.20 km) |
| Herndon to Caguas (Puerto Rico) | 1,586.43 mi (2,553.11 km) |
| Herndon to Cahokia (Illinois) | 689.16 mi (1,109.09 km) |
| Herndon to Calabasas (California) | 2,295.72 mi (3,694.60 km) |
| Herndon to Caldwell (Idaho) | 2,044.29 mi (3,289.96 km) |
| Herndon to Caledonia (Wisconsin) | 607.86 mi (978.26 km) |
| Herndon to Calera (Alabama) | 659.96 mi (1,062.10 km) |
| Herndon to Calexico (California) | 2,162.21 mi (3,479.74 km) |
| Herndon to Calhoun (Georgia) | 519.92 mi (836.74 km) |
| Herndon to California (Maryland) | 66.92 mi (107.70 km) |
| Herndon to California City (California) | 2,229.23 mi (3,587.60 km) |
| Herndon to Callaway (Florida) | 766.57 mi (1,233.68 km) |
| Herndon to Calumet City (Illinois) | 565.51 mi (910.11 km) |
| Herndon to Calverton (Maryland) | 24.28 mi (39.08 km) |
| Herndon to Camano (Washington) | 2,308.56 mi (3,715.27 km) |
