| Boulder to Spout Springs (North Carolina) | 1,465.73 mi (2,358.87 km) |
| Boulder to Spring (Texas) | 885.10 mi (1,424.43 km) |
| Boulder to Spring Creek (Nevada) | 546.44 mi (879.41 km) |
| Boulder to Spring Hill (Florida) | 1,516.42 mi (2,440.45 km) |
| Boulder to Spring Hill (Tennessee) | 1,040.80 mi (1,675.01 km) |
| Boulder to Spring Lake (North Carolina) | 1,469.85 mi (2,365.49 km) |
| Boulder to Spring Valley (California) | 822.95 mi (1,324.41 km) |
| Boulder to Spring Valley (Nevada) | 608.04 mi (978.55 km) |
| Boulder to Spring Valley (New York) | 1,630.67 mi (2,624.31 km) |
| Boulder to Springboro (Ohio) | 1,113.66 mi (1,792.27 km) |
| Boulder to Springdale (Arkansas) | 658.20 mi (1,059.27 km) |
| Boulder to Springdale (New Jersey) | 1,596.05 mi (2,568.59 km) |
| Boulder to Springdale (Ohio) | 1,103.81 mi (1,776.42 km) |
| Boulder to Springfield (Illinois) | 825.96 mi (1,329.26 km) |
| Boulder to Springfield (Massachusetts) | 1,699.69 mi (2,735.38 km) |
