| Hackettstown to Clemson (South Carolina) | 609.43 mi (980.78 km) |
| Hackettstown to Clermont (Florida) | 936.32 mi (1,506.86 km) |
| Hackettstown to Cleveland (Mississippi) | 1,000.41 mi (1,610.00 km) |
| Hackettstown to Cleveland (Ohio) | 359.04 mi (577.81 km) |
| Hackettstown to Cleveland (Tennessee) | 672.00 mi (1,081.48 km) |
| Hackettstown to Cleveland Heights (Ohio) | 353.21 mi (568.44 km) |
| Hackettstown to Cliffside Park (New Jersey) | 43.85 mi (70.57 km) |
| Hackettstown to Clifton (Colorado) | 1,774.43 mi (2,855.67 km) |
| Hackettstown to Clifton (New Jersey) | 34.92 mi (56.20 km) |
| Hackettstown to Clinton (Iowa) | 801.41 mi (1,289.75 km) |
| Hackettstown to Clinton (Maryland) | 182.56 mi (293.80 km) |
| Hackettstown to Clinton (Mississippi) | 1,039.33 mi (1,672.65 km) |
| Hackettstown to Clinton (Utah) | 1,927.04 mi (3,101.28 km) |
| Hackettstown to Clive (Iowa) | 985.20 mi (1,585.53 km) |
| Hackettstown to Cloquet (Minnesota) | 967.15 mi (1,556.47 km) |
