| National City to Portage (Michigan) | 1,837.10 mi (2,956.52 km) |
| National City to Portage (Wisconsin) | 1,669.16 mi (2,686.26 km) |
| National City to Portales (New Mexico) | 798.69 mi (1,285.36 km) |
| National City to Porterville (California) | 259.47 mi (417.58 km) |
| National City to Portland (Maine) | 2,617.14 mi (4,211.88 km) |
| National City to Portland (Oregon) | 937.23 mi (1,508.33 km) |
| National City to Portland (Tennessee) | 1,751.78 mi (2,819.22 km) |
| National City to Portland (Texas) | 1,222.73 mi (1,967.80 km) |
| National City to Portsmouth (New Hampshire) | 2,591.12 mi (4,170.00 km) |
| National City to Portsmouth (Ohio) | 1,949.84 mi (3,137.97 km) |
| National City to Portsmouth (Virginia) | 2,313.38 mi (3,723.02 km) |
| National City to Post Falls (Idaho) | 1,040.30 mi (1,674.19 km) |
| National City to Potomac (Maryland) | 2,259.13 mi (3,635.72 km) |
| National City to Potomac Park (California) | 214.89 mi (345.84 km) |
| National City to Pottstown (Pennsylvania) | 2,340.26 mi (3,766.29 km) |
