| Gretna to Kinston (North Carolina) | 813.53 mi (1,309.25 km) |
| Gretna to Kirkland (Washington) | 2,098.86 mi (3,377.78 km) |
| Gretna to Kirksville (Missouri) | 724.96 mi (1,166.71 km) |
| Gretna to Kirkwood (Missouri) | 599.32 mi (964.51 km) |
| Gretna to Kiryas Joel (New York) | 1,187.94 mi (1,911.81 km) |
| Gretna to Kissimmee (Florida) | 532.78 mi (857.43 km) |
| Gretna to Klamath Falls (Oregon) | 1,950.14 mi (3,138.44 km) |
| Gretna to Knightdale (North Carolina) | 783.33 mi (1,260.65 km) |
| Gretna to Knik-Fairview (Alaska) | 3,429.45 mi (5,519.16 km) |
| Gretna to Knoxville (Tennessee) | 547.86 mi (881.70 km) |
| Gretna to Kokomo (Indiana) | 761.89 mi (1,226.15 km) |
| Gretna to Kuna (Idaho) | 1,723.19 mi (2,773.20 km) |
| Gretna to Kyle (Texas) | 468.91 mi (754.64 km) |
| Gretna to La Cañada Flintridge (California) | 1,669.33 mi (2,686.53 km) |
| Gretna to La Crescenta-Montrose (California) | 1,671.40 mi (2,689.86 km) |
