| Gaithersburg to Castle Pines (Colorado) | 1,473.13 mi (2,370.78 km) |
| Gaithersburg to Castle Rock (Colorado) | 1,473.07 mi (2,370.68 km) |
| Gaithersburg to Castro Valley (California) | 2,404.83 mi (3,870.20 km) |
| Gaithersburg to Catalina Foothills (Arizona) | 1,934.87 mi (3,113.87 km) |
| Gaithersburg to Cataño (Puerto Rico) | 1,576.25 mi (2,536.74 km) |
| Gaithersburg to Cathedral City (California) | 2,193.64 mi (3,530.32 km) |
| Gaithersburg to Catonsville (Maryland) | 26.76 mi (43.06 km) |
| Gaithersburg to Cave Spring (Virginia) | 201.05 mi (323.56 km) |
| Gaithersburg to Cayce (South Carolina) | 416.70 mi (670.61 km) |
| Gaithersburg to Cayey (Puerto Rico) | 1,596.38 mi (2,569.12 km) |
| Gaithersburg to Cedar City (Utah) | 1,932.64 mi (3,110.29 km) |
| Gaithersburg to Cedar Falls (Iowa) | 829.09 mi (1,334.29 km) |
| Gaithersburg to Cedar Hill (Texas) | 1,191.68 mi (1,917.82 km) |
| Gaithersburg to Cedar Lake (Indiana) | 560.52 mi (902.07 km) |
| Gaithersburg to Cedar Mill (Oregon) | 2,337.59 mi (3,761.99 km) |
