| Gaithersburg to Carlsbad (California) | 2,255.68 mi (3,630.16 km) |
| Gaithersburg to Carlsbad (New Mexico) | 1,578.14 mi (2,539.77 km) |
| Gaithersburg to Carmel (Indiana) | 479.15 mi (771.11 km) |
| Gaithersburg to Carmichael (California) | 2,348.95 mi (3,780.27 km) |
| Gaithersburg to Carney (Maryland) | 41.35 mi (66.54 km) |
| Gaithersburg to Carnot-Moon (Pennsylvania) | 185.90 mi (299.18 km) |
| Gaithersburg to Carol Stream (Illinois) | 604.25 mi (972.45 km) |
| Gaithersburg to Carolina (Puerto Rico) | 1,582.47 mi (2,546.74 km) |
| Gaithersburg to Carolina Forest (South Carolina) | 382.81 mi (616.08 km) |
| Gaithersburg to Carpentersville (Illinois) | 615.87 mi (991.15 km) |
| Gaithersburg to Carpinteria (California) | 2,342.74 mi (3,770.27 km) |
| Gaithersburg to Carrboro (North Carolina) | 244.32 mi (393.20 km) |
| Gaithersburg to Carroll (Iowa) | 946.09 mi (1,522.58 km) |
| Gaithersburg to Carrollton (Georgia) | 581.80 mi (936.32 km) |
| Gaithersburg to Carrollton (Texas) | 1,175.68 mi (1,892.08 km) |
