| Gretna to Ukiah (California) | 1,979.53 mi (3,185.74 km) |
| Gretna to Union (Missouri) | 591.79 mi (952.40 km) |
| Gretna to Union City (California) | 1,901.35 mi (3,059.93 km) |
| Gretna to Union City (Georgia) | 410.71 mi (660.97 km) |
| Gretna to Union City (New Jersey) | 1,170.49 mi (1,883.72 km) |
| Gretna to Union City (Tennessee) | 453.97 mi (730.60 km) |
| Gretna to Union Hill-Novelty Hill (Washington) | 2,090.82 mi (3,364.85 km) |
| Gretna to Union Park (Florida) | 539.43 mi (868.13 km) |
| Gretna to Uniondale (New York) | 1,187.47 mi (1,911.04 km) |
| Gretna to Universal City (Texas) | 495.85 mi (797.99 km) |
| Gretna to University (Florida) | 477.38 mi (768.26 km) |
| Gretna to University City (Missouri) | 605.16 mi (973.92 km) |
| Gretna to University Heights (Ohio) | 931.07 mi (1,498.40 km) |
| Gretna to University of California-Santa Barbara (California) | 1,764.33 mi (2,839.42 km) |
| Gretna to University Park (Texas) | 446.45 mi (718.50 km) |
