| Boulder to Columbia (Illinois) | 810.90 mi (1,305.02 km) |
| Boulder to Columbia (Maryland) | 1,505.98 mi (2,423.64 km) |
| Boulder to Columbia (Missouri) | 692.65 mi (1,114.70 km) |
| Boulder to Columbia (Pennsylvania) | 1,514.76 mi (2,437.77 km) |
| Boulder to Columbia (South Carolina) | 1,400.16 mi (2,253.33 km) |
| Boulder to Columbia (Tennessee) | 1,036.83 mi (1,668.62 km) |
| Boulder to Columbia Heights (Minnesota) | 701.83 mi (1,129.49 km) |
| Boulder to Columbine (Colorado) | 31.71 mi (51.03 km) |
| Boulder to Columbus (Georgia) | 1,244.32 mi (2,002.53 km) |
| Boulder to Columbus (Indiana) | 1,028.56 mi (1,655.31 km) |
| Boulder to Columbus (Mississippi) | 1,032.95 mi (1,662.38 km) |
| Boulder to Columbus (Nebraska) | 424.60 mi (683.32 km) |
| Boulder to Columbus (Ohio) | 1,175.37 mi (1,891.58 km) |
| Boulder to Commack (New York) | 1,672.86 mi (2,692.20 km) |
| Boulder to Commerce (California) | 823.39 mi (1,325.12 km) |
