| Boulder to Chickasha (Oklahoma) | 527.65 mi (849.18 km) |
| Boulder to Chico (California) | 877.01 mi (1,411.42 km) |
| Boulder to Chicopee (Massachusetts) | 1,697.59 mi (2,732.01 km) |
| Boulder to Chillicothe (Ohio) | 1,181.45 mi (1,901.35 km) |
| Boulder to Chillum (Maryland) | 1,502.90 mi (2,418.69 km) |
| Boulder to Chino (California) | 800.93 mi (1,288.98 km) |
| Boulder to Chino Hills (California) | 805.05 mi (1,295.60 km) |
| Boulder to Chino Valley (Arizona) | 535.21 mi (861.33 km) |
| Boulder to Chippewa Falls (Wisconsin) | 782.25 mi (1,258.91 km) |
| Boulder to Choctaw (Oklahoma) | 537.15 mi (864.45 km) |
| Boulder to Chowchilla (California) | 832.96 mi (1,340.52 km) |
| Boulder to Christiansburg (Virginia) | 1,352.32 mi (2,176.35 km) |
| Boulder to Chubbuck (Idaho) | 423.46 mi (681.49 km) |
| Boulder to Chula Vista (California) | 829.32 mi (1,334.66 km) |
| Boulder to Cibolo (Texas) | 825.17 mi (1,327.98 km) |
