| Boulder to Cedar Rapids (Iowa) | 719.66 mi (1,158.18 km) |
| Boulder to Cedarburg (Wisconsin) | 917.54 mi (1,476.64 km) |
| Boulder to Celebration (Florida) | 1,570.79 mi (2,527.95 km) |
| Boulder to Celina (Ohio) | 1,088.53 mi (1,751.82 km) |
| Boulder to Celina (Texas) | 658.65 mi (1,059.99 km) |
| Boulder to Centennial (Colorado) | 36.19 mi (58.24 km) |
| Boulder to Center Point (Alabama) | 1,114.59 mi (1,793.76 km) |
| Boulder to Centereach (New York) | 1,682.99 mi (2,708.52 km) |
| Boulder to Centerton (Arkansas) | 646.07 mi (1,039.75 km) |
| Boulder to Centerville (Ohio) | 1,117.68 mi (1,798.73 km) |
| Boulder to Centerville (Utah) | 354.04 mi (569.77 km) |
| Boulder to Central (Louisiana) | 1,032.30 mi (1,661.33 km) |
| Boulder to Central Falls (Rhode Island) | 1,759.95 mi (2,832.37 km) |
| Boulder to Central Islip (New York) | 1,678.07 mi (2,700.60 km) |
| Boulder to Central Point (Oregon) | 930.51 mi (1,497.51 km) |
