| Gretna to Pell City (Alabama) | 336.23 mi (541.11 km) |
| Gretna to Pella (Iowa) | 810.25 mi (1,303.96 km) |
| Gretna to Pembroke Pines (Florida) | 650.74 mi (1,047.26 km) |
| Gretna to Pendleton (Oregon) | 1,894.79 mi (3,049.37 km) |
| Gretna to Pensacola (Florida) | 174.74 mi (281.22 km) |
| Gretna to Peoria (Arizona) | 1,330.11 mi (2,140.60 km) |
| Gretna to Peoria (Illinois) | 749.50 mi (1,206.21 km) |
| Gretna to Perris (California) | 1,612.27 mi (2,594.70 km) |
| Gretna to Perry (Georgia) | 413.43 mi (665.35 km) |
| Gretna to Perry Hall (Maryland) | 1,010.65 mi (1,626.48 km) |
| Gretna to Perrysburg (Ohio) | 879.51 mi (1,415.44 km) |
| Gretna to Perth Amboy (New Jersey) | 1,150.41 mi (1,851.40 km) |
| Gretna to Peru (Indiana) | 782.14 mi (1,258.74 km) |
| Gretna to Petal (Mississippi) | 110.53 mi (177.88 km) |
| Gretna to Petaluma (California) | 1,939.67 mi (3,121.60 km) |
