| Duncan to Caldicot | 4,597.26 mi (7,398.57 km) |
| Duncan to Calne | 4,630.58 mi (7,452.20 km) |
| Duncan to Cam | 4,608.59 mi (7,416.80 km) |
| Duncan to Camberley | 4,682.15 mi (7,535.19 km) |
| Duncan to Camborne | 4,539.13 mi (7,305.02 km) |
| Duncan to Cambridge | 4,686.26 mi (7,541.81 km) |
| Duncan to Cambuslang | 4,420.29 mi (7,113.77 km) |
| Duncan to Canford Cliffs | 4,656.85 mi (7,494.48 km) |
| Duncan to Cannock | 4,590.60 mi (7,387.85 km) |
| Duncan to Canterbury | 4,753.05 mi (7,649.30 km) |
| Duncan to Carlisle | 4,490.58 mi (7,226.89 km) |
| Duncan to Carlton Colville | 4,736.19 mi (7,622.15 km) |
| Duncan to Carluke | 4,434.51 mi (7,136.65 km) |
| Duncan to Carnoustie | 4,452.10 mi (7,164.97 km) |
| Duncan to Carshalton | 4,703.01 mi (7,568.76 km) |
