| Boulder to Camas (Washington) | 949.59 mi (1,528.21 km) |
| Boulder to Cambridge (Maryland) | 1,556.45 mi (2,504.86 km) |
| Boulder to Cambridge (Massachusetts) | 1,769.97 mi (2,848.48 km) |
| Boulder to Camden (Arkansas) | 817.43 mi (1,315.53 km) |
| Boulder to Camden (New Jersey) | 1,588.29 mi (2,556.11 km) |
| Boulder to Cameron Park (California) | 844.75 mi (1,359.49 km) |
| Boulder to Camp Pendleton South (California) | 819.37 mi (1,318.65 km) |
| Boulder to Camp Springs (Maryland) | 1,508.34 mi (2,427.44 km) |
| Boulder to Camp Verde (Arizona) | 522.98 mi (841.66 km) |
| Boulder to Campbell (California) | 919.45 mi (1,479.71 km) |
| Boulder to Campbellsville (Kentucky) | 1,086.84 mi (1,749.10 km) |
| Boulder to Campton Hills (Illinois) | 886.61 mi (1,426.86 km) |
| Boulder to Canby (Oregon) | 954.71 mi (1,536.45 km) |
| Boulder to Candelaria (Puerto Rico) | 2,755.13 mi (4,433.95 km) |
| Boulder to Candler-McAfee (Georgia) | 1,234.86 mi (1,987.32 km) |
