| Gaithersburg to Conyers (Georgia) | 533.68 mi (858.87 km) |
| Gaithersburg to Cookeville (Tennessee) | 498.41 mi (802.12 km) |
| Gaithersburg to Coolidge (Arizona) | 1,952.09 mi (3,141.59 km) |
| Gaithersburg to Coon Rapids (Minnesota) | 921.82 mi (1,483.53 km) |
| Gaithersburg to Cooper City (Florida) | 921.67 mi (1,483.28 km) |
| Gaithersburg to Coos Bay (Oregon) | 2,427.36 mi (3,906.45 km) |
| Gaithersburg to Copiague (New York) | 228.62 mi (367.92 km) |
| Gaithersburg to Coppell (Texas) | 1,181.14 mi (1,900.86 km) |
| Gaithersburg to Copperas Cove (Texas) | 1,290.21 mi (2,076.39 km) |
| Gaithersburg to Coral Gables (Florida) | 944.80 mi (1,520.51 km) |
| Gaithersburg to Coral Springs (Florida) | 906.15 mi (1,458.31 km) |
| Gaithersburg to Coral Terrace (Florida) | 942.26 mi (1,516.43 km) |
| Gaithersburg to Coralville (Iowa) | 776.09 mi (1,249.00 km) |
| Gaithersburg to Coram (New York) | 253.21 mi (407.51 km) |
| Gaithersburg to Corcoran (California) | 2,306.52 mi (3,711.99 km) |
