| Mercer Island to Castle Pines (Colorado) | 1,030.93 mi (1,659.13 km) |
| Mercer Island to Castle Rock (Colorado) | 1,035.37 mi (1,666.26 km) |
| Mercer Island to Castro Valley (California) | 681.13 mi (1,096.17 km) |
| Mercer Island to Catalina Foothills (Arizona) | 1,210.87 mi (1,948.71 km) |
| Mercer Island to Cataño (Puerto Rico) | 3,717.49 mi (5,982.72 km) |
| Mercer Island to Cathedral City (California) | 994.87 mi (1,601.08 km) |
| Mercer Island to Catonsville (Maryland) | 2,318.51 mi (3,731.29 km) |
| Mercer Island to Cave Spring (Virginia) | 2,238.51 mi (3,602.53 km) |
| Mercer Island to Cayce (South Carolina) | 2,318.36 mi (3,731.04 km) |
| Mercer Island to Cayey (Puerto Rico) | 3,732.69 mi (6,007.18 km) |
| Mercer Island to Cedar City (Utah) | 824.56 mi (1,327.00 km) |
| Mercer Island to Cedar Falls (Iowa) | 1,485.11 mi (2,390.05 km) |
| Mercer Island to Cedar Hill (Texas) | 1,677.33 mi (2,699.40 km) |
| Mercer Island to Cedar Lake (Indiana) | 1,752.26 mi (2,819.99 km) |
| Mercer Island to Cedar Mill (Oregon) | 142.88 mi (229.94 km) |
