| Gretna to Point Pleasant (New Jersey) | 1,142.22 mi (1,838.23 km) |
| Gretna to Pomona (California) | 1,643.89 mi (2,645.58 km) |
| Gretna to Pompano Beach (Florida) | 655.37 mi (1,054.72 km) |
| Gretna to Pompton Lakes (New Jersey) | 1,169.09 mi (1,881.47 km) |
| Gretna to Pompton Plains (New Jersey) | 1,166.78 mi (1,877.75 km) |
| Gretna to Ponca City (Oklahoma) | 620.66 mi (998.85 km) |
| Gretna to Ponce (Puerto Rico) | 1,687.17 mi (2,715.24 km) |
| Gretna to Pontiac (Illinois) | 762.71 mi (1,227.47 km) |
| Gretna to Pontiac (Michigan) | 956.59 mi (1,539.49 km) |
| Gretna to Pooler (Georgia) | 542.24 mi (872.65 km) |
| Gretna to Poplar Bluff (Missouri) | 473.96 mi (762.77 km) |
| Gretna to Poquoson (Virginia) | 931.89 mi (1,499.74 km) |
| Gretna to Port Angeles (Washington) | 2,163.49 mi (3,481.80 km) |
| Gretna to Port Arthur (Texas) | 232.15 mi (373.62 km) |
| Gretna to Port Charlotte (Florida) | 522.48 mi (840.85 km) |
