| Echelon to Castle Pines (Colorado) | 1,581.96 mi (2,545.92 km) |
| Echelon to Castle Rock (Colorado) | 1,582.17 mi (2,546.26 km) |
| Echelon to Castro Valley (California) | 2,510.05 mi (4,039.54 km) |
| Echelon to Catalina Foothills (Arizona) | 2,055.85 mi (3,308.57 km) |
| Echelon to Cataño (Puerto Rico) | 1,570.72 mi (2,527.84 km) |
| Echelon to Cathedral City (California) | 2,309.23 mi (3,716.34 km) |
| Echelon to Catonsville (Maryland) | 101.41 mi (163.20 km) |
| Echelon to Cave Spring (Virginia) | 325.80 mi (524.32 km) |
| Echelon to Cayce (South Carolina) | 526.93 mi (848.01 km) |
| Echelon to Cayey (Puerto Rico) | 1,591.58 mi (2,561.40 km) |
| Echelon to Cedar City (Utah) | 2,042.47 mi (3,287.05 km) |
| Echelon to Cedar Falls (Iowa) | 924.61 mi (1,488.02 km) |
| Echelon to Cedar Hill (Texas) | 1,318.88 mi (2,122.53 km) |
| Echelon to Cedar Lake (Indiana) | 660.50 mi (1,062.98 km) |
| Echelon to Cedar Mill (Oregon) | 2,422.75 mi (3,899.04 km) |
