| Idar-Oberstein to Caguas (Puerto Rico) | 4,525.98 mi (7,283.86 km) |
| Idar-Oberstein to Cahokia (Illinois) | 4,547.74 mi (7,318.88 km) |
| Idar-Oberstein to Calabasas (California) | 5,767.67 mi (9,282.17 km) |
| Idar-Oberstein to Caldwell (Idaho) | 5,156.63 mi (8,298.80 km) |
| Idar-Oberstein to Caledonia (Wisconsin) | 4,257.39 mi (6,851.61 km) |
| Idar-Oberstein to Calera (Alabama) | 4,681.60 mi (7,534.31 km) |
| Idar-Oberstein to Calexico (California) | 5,753.99 mi (9,260.15 km) |
| Idar-Oberstein to Calhoun (Georgia) | 4,541.60 mi (7,309.00 km) |
| Idar-Oberstein to California (Maryland) | 4,018.83 mi (6,467.68 km) |
| Idar-Oberstein to California City (California) | 5,683.89 mi (9,147.33 km) |
| Idar-Oberstein to Callaway (Florida) | 4,781.91 mi (7,695.74 km) |
| Idar-Oberstein to Calumet City (Illinois) | 4,301.19 mi (6,922.10 km) |
| Idar-Oberstein to Calverton (Maryland) | 4,003.09 mi (6,442.35 km) |
| Idar-Oberstein to Camano (Washington) | 5,042.63 mi (8,115.33 km) |
| Idar-Oberstein to Camarillo (California) | 5,773.55 mi (9,291.63 km) |
