| Johnston to Portage (Michigan) | 419.26 mi (674.74 km) |
| Johnston to Portage (Wisconsin) | 251.62 mi (404.94 km) |
| Johnston to Portales (New Mexico) | 737.48 mi (1,186.86 km) |
| Johnston to Porterville (California) | 1,410.03 mi (2,269.22 km) |
| Johnston to Portland (Maine) | 1,194.98 mi (1,923.13 km) |
| Johnston to Portland (Oregon) | 1,462.94 mi (2,354.37 km) |
| Johnston to Portland (Tennessee) | 522.10 mi (840.24 km) |
| Johnston to Portland (Texas) | 974.70 mi (1,568.63 km) |
| Johnston to Portsmouth (New Hampshire) | 1,171.11 mi (1,884.71 km) |
| Johnston to Portsmouth (Ohio) | 603.26 mi (970.86 km) |
| Johnston to Portsmouth (Virginia) | 985.42 mi (1,585.88 km) |
| Johnston to Post Falls (Idaho) | 1,208.15 mi (1,944.33 km) |
| Johnston to Potomac (Maryland) | 888.27 mi (1,429.54 km) |
| Johnston to Potomac Park (California) | 1,426.66 mi (2,295.98 km) |
| Johnston to Pottstown (Pennsylvania) | 946.62 mi (1,523.44 km) |
