| Greenock to Portage (Michigan) | 3,557.43 mi (5,725.13 km) |
| Greenock to Portage (Wisconsin) | 3,629.56 mi (5,841.21 km) |
| Greenock to Portales (New Mexico) | 4,605.62 mi (7,412.04 km) |
| Greenock to Porterville (California) | 5,005.02 mi (8,054.79 km) |
| Greenock to Portland (Maine) | 2,919.99 mi (4,699.27 km) |
| Greenock to Portland (Oregon) | 4,555.07 mi (7,330.67 km) |
| Greenock to Portland (Tennessee) | 3,873.25 mi (6,233.40 km) |
| Greenock to Portland (Texas) | 4,737.14 mi (7,623.70 km) |
| Greenock to Portsmouth (New Hampshire) | 2,967.45 mi (4,775.64 km) |
| Greenock to Portsmouth (Ohio) | 3,630.71 mi (5,843.07 km) |
| Greenock to Portsmouth (Virginia) | 3,477.41 mi (5,596.35 km) |
| Greenock to Post Falls (Idaho) | 4,277.53 mi (6,884.02 km) |
| Greenock to Potomac (Maryland) | 3,402.03 mi (5,475.04 km) |
| Greenock to Potomac Park (California) | 5,043.86 mi (8,117.31 km) |
| Greenock to Pottstown (Pennsylvania) | 3,283.32 mi (5,283.99 km) |
