| Gretna to Clemson (South Carolina) | 535.95 mi (862.53 km) |
| Gretna to Clermont (Florida) | 511.16 mi (822.63 km) |
| Gretna to Cleveland (Mississippi) | 267.86 mi (431.08 km) |
| Gretna to Cleveland (Ohio) | 925.88 mi (1,490.05 km) |
| Gretna to Cleveland (Tennessee) | 472.82 mi (760.92 km) |
| Gretna to Cleveland Heights (Ohio) | 931.20 mi (1,498.63 km) |
| Gretna to Cliffside Park (New Jersey) | 1,174.55 mi (1,890.26 km) |
| Gretna to Clifton (Colorado) | 1,221.21 mi (1,965.35 km) |
| Gretna to Clifton (New Jersey) | 1,168.92 mi (1,881.20 km) |
| Gretna to Clinton (Iowa) | 824.59 mi (1,327.04 km) |
| Gretna to Clinton (Maryland) | 965.46 mi (1,553.76 km) |
| Gretna to Clinton (Mississippi) | 169.72 mi (273.14 km) |
| Gretna to Clinton (Utah) | 1,454.49 mi (2,340.77 km) |
| Gretna to Clive (Iowa) | 835.30 mi (1,344.29 km) |
| Gretna to Cloquet (Minnesota) | 1,168.95 mi (1,881.25 km) |
