| Holt to Carlsbad (California) | 1,889.05 mi (3,040.13 km) |
| Holt to Carlsbad (New Mexico) | 1,286.12 mi (2,069.81 km) |
| Holt to Carmel (Indiana) | 203.04 mi (326.76 km) |
| Holt to Carmichael (California) | 1,933.56 mi (3,111.77 km) |
| Holt to Carney (Maryland) | 473.24 mi (761.60 km) |
| Holt to Carnot-Moon (Pennsylvania) | 266.79 mi (429.35 km) |
| Holt to Carol Stream (Illinois) | 190.68 mi (306.87 km) |
| Holt to Carolina (Puerto Rico) | 1,995.75 mi (3,211.85 km) |
| Holt to Carolina Forest (South Carolina) | 684.56 mi (1,101.69 km) |
| Holt to Carpentersville (Illinois) | 195.14 mi (314.05 km) |
| Holt to Carpinteria (California) | 1,959.27 mi (3,153.14 km) |
| Holt to Carrboro (North Carolina) | 547.47 mi (881.06 km) |
| Holt to Carroll (Iowa) | 528.77 mi (850.97 km) |
| Holt to Carrollton (Georgia) | 626.69 mi (1,008.56 km) |
| Holt to Carrollton (Texas) | 947.06 mi (1,524.14 km) |
