| Boulder to Sumter (South Carolina) | 1,429.62 mi (2,300.75 km) |
| Boulder to Sun City (Arizona) | 588.83 mi (947.63 km) |
| Boulder to Sun City Center (Florida) | 1,557.48 mi (2,506.53 km) |
| Boulder to Sun City West (Arizona) | 588.76 mi (947.52 km) |
| Boulder to Sun Lakes (Arizona) | 596.17 mi (959.44 km) |
| Boulder to Sun Prairie (Wisconsin) | 854.26 mi (1,374.80 km) |
| Boulder to Sun Valley (Nevada) | 770.49 mi (1,239.99 km) |
| Boulder to Sun Village (California) | 792.73 mi (1,275.78 km) |
| Boulder to Sunland Park (New Mexico) | 571.83 mi (920.27 km) |
| Boulder to Sunny Isles Beach (Florida) | 1,741.77 mi (2,803.11 km) |
| Boulder to Sunnyside (Washington) | 859.18 mi (1,382.71 km) |
| Boulder to Sunnyvale (California) | 921.15 mi (1,482.45 km) |
| Boulder to Sunrise (Florida) | 1,723.83 mi (2,774.24 km) |
| Boulder to Sunrise Manor (Nevada) | 594.78 mi (957.21 km) |
| Boulder to Sunset (Florida) | 1,741.40 mi (2,802.52 km) |
