| Blackburn to Portage (Michigan) | 3,699.29 mi (5,953.43 km) |
| Blackburn to Portage (Wisconsin) | 3,777.95 mi (6,080.03 km) |
| Blackburn to Portales (New Mexico) | 4,757.57 mi (7,656.57 km) |
| Blackburn to Porterville (California) | 5,172.80 mi (8,324.82 km) |
| Blackburn to Portland (Maine) | 3,044.43 mi (4,899.54 km) |
| Blackburn to Portland (Oregon) | 4,729.08 mi (7,610.72 km) |
| Blackburn to Portland (Tennessee) | 4,007.02 mi (6,448.67 km) |
| Blackburn to Portland (Texas) | 4,873.93 mi (7,843.83 km) |
| Blackburn to Portsmouth (New Hampshire) | 3,091.12 mi (4,974.68 km) |
| Blackburn to Portsmouth (Ohio) | 3,763.11 mi (6,056.15 km) |
| Blackburn to Portsmouth (Virginia) | 3,595.95 mi (5,787.12 km) |
| Blackburn to Post Falls (Idaho) | 4,450.15 mi (7,161.83 km) |
| Blackburn to Potomac (Maryland) | 3,526.42 mi (5,675.22 km) |
| Blackburn to Potomac Park (California) | 5,211.21 mi (8,386.63 km) |
| Blackburn to Pottstown (Pennsylvania) | 3,407.92 mi (5,484.52 km) |
