| Howard to Carlsbad (California) | 1,745.63 mi (2,809.33 km) |
| Howard to Carlsbad (New Mexico) | 1,207.98 mi (1,944.06 km) |
| Howard to Carmel (Indiana) | 333.37 mi (536.51 km) |
| Howard to Carmichael (California) | 1,752.39 mi (2,820.20 km) |
| Howard to Carney (Maryland) | 692.12 mi (1,113.86 km) |
| Howard to Carnot-Moon (Pennsylvania) | 488.58 mi (786.30 km) |
| Howard to Carol Stream (Illinois) | 183.26 mi (294.93 km) |
| Howard to Carolina (Puerto Rico) | 2,212.80 mi (3,561.15 km) |
| Howard to Carolina Forest (South Carolina) | 892.65 mi (1,436.58 km) |
| Howard to Carpentersville (Illinois) | 169.40 mi (272.63 km) |
| Howard to Carpinteria (California) | 1,802.80 mi (2,901.33 km) |
| Howard to Carrboro (North Carolina) | 762.04 mi (1,226.38 km) |
| Howard to Carroll (Iowa) | 381.56 mi (614.06 km) |
| Howard to Carrollton (Georgia) | 776.04 mi (1,248.92 km) |
| Howard to Carrollton (Texas) | 928.93 mi (1,494.96 km) |
