| Gretna to Pottsville (Pennsylvania) | 1,075.91 mi (1,731.50 km) |
| Gretna to Poughkeepsie (New York) | 1,212.77 mi (1,951.76 km) |
| Gretna to Poulsbo (Washington) | 2,118.59 mi (3,409.54 km) |
| Gretna to Poway (California) | 1,599.37 mi (2,573.93 km) |
| Gretna to Powder Springs (Georgia) | 416.84 mi (670.83 km) |
| Gretna to Powell (Ohio) | 810.39 mi (1,304.20 km) |
| Gretna to Powell (Tennessee) | 548.34 mi (882.47 km) |
| Gretna to Prairie Ridge (Washington) | 2,080.66 mi (3,348.50 km) |
| Gretna to Prairie Village (Kansas) | 679.14 mi (1,092.98 km) |
| Gretna to Prairieville (Louisiana) | 60.93 mi (98.06 km) |
| Gretna to Prattville (Alabama) | 275.95 mi (444.10 km) |
| Gretna to Preakness (New Jersey) | 1,169.10 mi (1,881.49 km) |
| Gretna to Prescott (Arizona) | 1,344.88 mi (2,164.38 km) |
| Gretna to Prescott Valley (Arizona) | 1,337.74 mi (2,152.89 km) |
| Gretna to Prichard (Alabama) | 129.17 mi (207.88 km) |
