| Boulder to Centralia (Illinois) | 867.72 mi (1,396.46 km) |
| Boulder to Centralia (Washington) | 999.81 mi (1,609.03 km) |
| Boulder to Centreville (Virginia) | 1,480.54 mi (2,382.69 km) |
| Boulder to Ceres (California) | 861.09 mi (1,385.78 km) |
| Boulder to Cerritos (California) | 824.47 mi (1,326.86 km) |
| Boulder to Chalco (Nebraska) | 484.66 mi (779.99 km) |
| Boulder to Chalmette (Louisiana) | 1,108.03 mi (1,783.20 km) |
| Boulder to Chambersburg (Pennsylvania) | 1,455.24 mi (2,341.98 km) |
| Boulder to Chamblee (Georgia) | 1,228.55 mi (1,977.16 km) |
| Boulder to Champaign (Illinois) | 896.40 mi (1,442.61 km) |
| Boulder to Champlin (Minnesota) | 699.23 mi (1,125.31 km) |
| Boulder to Chandler (Arizona) | 591.90 mi (952.58 km) |
| Boulder to Chanhassen (Minnesota) | 682.19 mi (1,097.88 km) |
| Boulder to Channahon (Illinois) | 893.55 mi (1,438.03 km) |
| Boulder to Channelview (Texas) | 909.65 mi (1,463.94 km) |
