| Duncan to Portage (Michigan) | 850.68 mi (1,369.03 km) |
| Duncan to Portage (Wisconsin) | 769.32 mi (1,238.10 km) |
| Duncan to Portales (New Mexico) | 310.99 mi (500.49 km) |
| Duncan to Porterville (California) | 1,192.77 mi (1,919.59 km) |
| Duncan to Portland (Maine) | 1,601.53 mi (2,577.42 km) |
| Duncan to Portland (Oregon) | 1,503.62 mi (2,419.84 km) |
| Duncan to Portland (Tennessee) | 655.64 mi (1,055.15 km) |
| Duncan to Portland (Texas) | 460.57 mi (741.22 km) |
| Duncan to Portsmouth (New Hampshire) | 1,566.67 mi (2,521.31 km) |
| Duncan to Portsmouth (Ohio) | 878.54 mi (1,413.87 km) |
| Duncan to Portsmouth (Virginia) | 1,218.04 mi (1,960.25 km) |
| Duncan to Post Falls (Idaho) | 1,338.15 mi (2,153.54 km) |
| Duncan to Potomac (Maryland) | 1,185.05 mi (1,907.15 km) |
| Duncan to Potomac Park (California) | 1,190.83 mi (1,916.45 km) |
| Duncan to Pottstown (Pennsylvania) | 1,280.83 mi (2,061.30 km) |
