| Harker Heights to Cadillac (Michigan) | 1,127.87 mi (1,815.13 km) |
| Harker Heights to Caguas (Puerto Rico) | 2,163.33 mi (3,481.54 km) |
| Harker Heights to Cahokia (Illinois) | 669.12 mi (1,076.85 km) |
| Harker Heights to Calabasas (California) | 1,239.88 mi (1,995.39 km) |
| Harker Heights to Caldwell (Idaho) | 1,353.29 mi (2,177.91 km) |
| Harker Heights to Caledonia (Wisconsin) | 972.74 mi (1,565.47 km) |
| Harker Heights to Calera (Alabama) | 653.49 mi (1,051.69 km) |
| Harker Heights to Calexico (California) | 1,052.13 mi (1,693.24 km) |
| Harker Heights to Calhoun (Georgia) | 774.68 mi (1,246.73 km) |
| Harker Heights to California (Maryland) | 1,297.82 mi (2,088.64 km) |
| Harker Heights to California City (California) | 1,202.15 mi (1,934.67 km) |
| Harker Heights to Callaway (Florida) | 721.37 mi (1,160.93 km) |
| Harker Heights to Calumet City (Illinois) | 919.23 mi (1,479.36 km) |
| Harker Heights to Calverton (Maryland) | 1,290.43 mi (2,076.74 km) |
| Harker Heights to Camano (Washington) | 1,759.34 mi (2,831.38 km) |
