| Gretna to Brown Deer (Wisconsin) | 923.60 mi (1,486.39 km) |
| Gretna to Brownsburg (Indiana) | 716.31 mi (1,152.78 km) |
| Gretna to Brownsville (Florida) | 662.09 mi (1,065.53 km) |
| Gretna to Brownsville (Texas) | 526.50 mi (847.32 km) |
| Gretna to Brownwood (Texas) | 543.90 mi (875.32 km) |
| Gretna to Brunswick (Georgia) | 517.40 mi (832.68 km) |
| Gretna to Brunswick (Ohio) | 908.62 mi (1,462.28 km) |
| Gretna to Brushy Creek (Texas) | 460.78 mi (741.55 km) |
| Gretna to Bryan (Texas) | 381.15 mi (613.40 km) |
| Gretna to Bryant (Arkansas) | 354.94 mi (571.21 km) |
| Gretna to Bryn Mawr-Skyway (Washington) | 2,094.68 mi (3,371.06 km) |
| Gretna to Buckeye (Arizona) | 1,347.76 mi (2,169.00 km) |
| Gretna to Buckhall (Virginia) | 940.78 mi (1,514.04 km) |
| Gretna to Bucyrus (Ohio) | 851.22 mi (1,369.90 km) |
| Gretna to Buda (Texas) | 466.64 mi (750.99 km) |
