| Duncan to Norton Shores (Michigan) | 863.93 mi (1,390.36 km) |
| Duncan to Norwalk (California) | 1,150.74 mi (1,851.93 km) |
| Duncan to Norwalk (Connecticut) | 1,406.47 mi (2,263.50 km) |
| Duncan to Norwalk (Iowa) | 532.29 mi (856.64 km) |
| Duncan to Norwalk (Ohio) | 952.80 mi (1,533.39 km) |
| Duncan to Norwich (Connecticut) | 1,480.05 mi (2,381.90 km) |
| Duncan to Norwood (Ohio) | 809.09 mi (1,302.10 km) |
| Duncan to Novato (California) | 1,389.07 mi (2,235.48 km) |
| Duncan to Novi (Michigan) | 951.61 mi (1,531.47 km) |
| Duncan to O'Fallon (Illinois) | 525.01 mi (844.92 km) |
| Duncan to O'Fallon (Missouri) | 495.12 mi (796.82 km) |
| Duncan to Oak Creek (Wisconsin) | 788.72 mi (1,269.33 km) |
| Duncan to Oak Forest (Illinois) | 736.73 mi (1,185.65 km) |
| Duncan to Oak Grove (Oregon) | 1,499.86 mi (2,413.79 km) |
| Duncan to Oak Grove (South Carolina) | 957.62 mi (1,541.14 km) |
