| Gretna to Troy (Michigan) | 955.50 mi (1,537.72 km) |
| Gretna to Troy (Missouri) | 628.21 mi (1,011.01 km) |
| Gretna to Troy (New York) | 1,266.97 mi (2,038.99 km) |
| Gretna to Troy (Ohio) | 773.66 mi (1,245.08 km) |
| Gretna to Truckee (California) | 1,822.55 mi (2,933.11 km) |
| Gretna to Trujillo Alto (Puerto Rico) | 1,707.82 mi (2,748.47 km) |
| Gretna to Trumbull Center (Connecticut) | 1,225.51 mi (1,972.27 km) |
| Gretna to Trussville (Alabama) | 328.54 mi (528.74 km) |
| Gretna to Tualatin (Oregon) | 2,063.88 mi (3,321.50 km) |
| Gretna to Tuckahoe (Virginia) | 889.86 mi (1,432.09 km) |
| Gretna to Tucker (Georgia) | 437.62 mi (704.28 km) |
| Gretna to Tucson (Arizona) | 1,240.80 mi (1,996.88 km) |
| Gretna to Tucson Estates (Arizona) | 1,255.35 mi (2,020.29 km) |
| Gretna to Tucson Mountains (Arizona) | 1,252.69 mi (2,016.01 km) |
| Gretna to Tukwila (Washington) | 2,095.48 mi (3,372.35 km) |
