| Gretna to Joliet (Illinois) | 809.08 mi (1,302.10 km) |
| Gretna to Jonesboro (Arkansas) | 410.04 mi (659.89 km) |
| Gretna to Joplin (Missouri) | 557.37 mi (897.01 km) |
| Gretna to Joppatowne (Maryland) | 1,016.56 mi (1,635.99 km) |
| Gretna to Juana Díaz (Puerto Rico) | 1,692.04 mi (2,723.07 km) |
| Gretna to Junction City (Kansas) | 738.95 mi (1,189.22 km) |
| Gretna to Juneau (Alaska) | 2,858.16 mi (4,599.77 km) |
| Gretna to Jupiter (Florida) | 638.04 mi (1,026.83 km) |
| Gretna to Jupiter Farms (Florida) | 631.89 mi (1,016.93 km) |
| Gretna to Jurupa Valley (California) | 1,627.02 mi (2,618.43 km) |
| Gretna to Justice (Illinois) | 827.31 mi (1,331.43 km) |
| Gretna to Kahului (Hawaii) | 4,137.40 mi (6,658.50 km) |
| Gretna to Kailua (Hawaii) | 4,198.93 mi (6,757.52 km) |
| Gretna to Kalamazoo (Michigan) | 889.57 mi (1,431.62 km) |
| Gretna to Kalispell (Montana) | 1,800.66 mi (2,897.88 km) |
