| Boulder to Cottage Grove (Oregon) | 949.73 mi (1,528.44 km) |
| Boulder to Cottage Lake (Washington) | 989.96 mi (1,593.19 km) |
| Boulder to Cottonwood (Arizona) | 520.94 mi (838.37 km) |
| Boulder to Cottonwood Heights (Utah) | 347.99 mi (560.04 km) |
| Boulder to Council Bluffs (Iowa) | 499.75 mi (804.26 km) |
| Boulder to Country Club (Florida) | 1,732.88 mi (2,788.79 km) |
| Boulder to Country Club Hills (Illinois) | 921.35 mi (1,482.77 km) |
| Boulder to Country Walk (Florida) | 1,740.83 mi (2,801.59 km) |
| Boulder to Covina (California) | 806.95 mi (1,298.66 km) |
| Boulder to Covington (Georgia) | 1,260.53 mi (2,028.62 km) |
| Boulder to Covington (Kentucky) | 1,104.67 mi (1,777.80 km) |
| Boulder to Covington (Louisiana) | 1,076.53 mi (1,732.51 km) |
| Boulder to Covington (Washington) | 979.79 mi (1,576.81 km) |
| Boulder to Cranston (Rhode Island) | 1,756.33 mi (2,826.54 km) |
| Boulder to Crawfordsville (Indiana) | 969.29 mi (1,559.91 km) |
