| Ronkonkoma to Clemson (South Carolina) | 676.73 mi (1,089.10 km) |
| Ronkonkoma to Clermont (Florida) | 977.30 mi (1,572.81 km) |
| Ronkonkoma to Cleveland (Mississippi) | 1,081.09 mi (1,739.84 km) |
| Ronkonkoma to Cleveland (Ohio) | 447.43 mi (720.08 km) |
| Ronkonkoma to Cleveland (Tennessee) | 747.33 mi (1,202.70 km) |
| Ronkonkoma to Cleveland Heights (Ohio) | 441.54 mi (710.58 km) |
| Ronkonkoma to Cliffside Park (New Jersey) | 45.16 mi (72.68 km) |
| Ronkonkoma to Clifton (Colorado) | 1,863.04 mi (2,998.28 km) |
| Ronkonkoma to Clifton (New Jersey) | 54.15 mi (87.15 km) |
| Ronkonkoma to Clinton (Iowa) | 889.57 mi (1,431.63 km) |
| Ronkonkoma to Clinton (Maryland) | 245.85 mi (395.66 km) |
| Ronkonkoma to Clinton (Mississippi) | 1,116.43 mi (1,796.72 km) |
| Ronkonkoma to Clinton (Utah) | 2,014.38 mi (3,241.82 km) |
| Ronkonkoma to Clive (Iowa) | 1,073.48 mi (1,727.60 km) |
| Ronkonkoma to Cloquet (Minnesota) | 1,045.87 mi (1,683.16 km) |
