| Duncan to Cottage Grove (Minnesota) | 757.60 mi (1,219.25 km) |
| Duncan to Cottage Grove (Oregon) | 1,482.69 mi (2,386.16 km) |
| Duncan to Cottage Lake (Washington) | 1,542.31 mi (2,482.11 km) |
| Duncan to Cottonwood (Arizona) | 799.93 mi (1,287.36 km) |
| Duncan to Cottonwood Heights (Utah) | 867.32 mi (1,395.82 km) |
| Duncan to Council Bluffs (Iowa) | 476.18 mi (766.34 km) |
| Duncan to Country Club (Florida) | 1,204.89 mi (1,939.08 km) |
| Duncan to Country Club Hills (Illinois) | 736.07 mi (1,184.59 km) |
| Duncan to Country Walk (Florida) | 1,210.41 mi (1,947.96 km) |
| Duncan to Covina (California) | 1,137.65 mi (1,830.88 km) |
| Duncan to Covington (Georgia) | 807.48 mi (1,299.52 km) |
| Duncan to Covington (Kentucky) | 803.05 mi (1,292.39 km) |
| Duncan to Covington (Louisiana) | 534.26 mi (859.81 km) |
| Duncan to Covington (Washington) | 1,531.59 mi (2,464.86 km) |
| Duncan to Cranston (Rhode Island) | 1,513.36 mi (2,435.52 km) |
