| Boulder to University Place (Washington) | 994.31 mi (1,600.19 km) |
| Boulder to Upland (California) | 795.42 mi (1,280.10 km) |
| Boulder to Upper Arlington (Ohio) | 1,170.56 mi (1,883.83 km) |
| Boulder to Upper Grand Lagoon (Florida) | 1,291.89 mi (2,079.10 km) |
| Boulder to Upper Montclair (New Jersey) | 1,625.43 mi (2,615.88 km) |
| Boulder to Urbana (Illinois) | 900.44 mi (1,449.12 km) |
| Boulder to Urbana (Maryland) | 1,478.92 mi (2,380.10 km) |
| Boulder to Urbana (Ohio) | 1,133.99 mi (1,824.99 km) |
| Boulder to Urbandale (Iowa) | 609.49 mi (980.88 km) |
| Boulder to Utica (New York) | 1,558.31 mi (2,507.85 km) |
| Boulder to Uvalde (Texas) | 808.69 mi (1,301.46 km) |
| Boulder to Vacaville (California) | 901.09 mi (1,450.17 km) |
| Boulder to Vadnais Heights (Minnesota) | 709.70 mi (1,142.15 km) |
| Boulder to Vail (Arizona) | 630.72 mi (1,015.05 km) |
| Boulder to Valdosta (Georgia) | 1,384.67 mi (2,228.42 km) |
