| Duncan to Camarillo (California) | 1,201.78 mi (1,934.08 km) |
| Duncan to Camas (Washington) | 1,495.39 mi (2,406.60 km) |
| Duncan to Cambridge (Maryland) | 1,240.51 mi (1,996.41 km) |
| Duncan to Cambridge (Massachusetts) | 1,539.98 mi (2,478.35 km) |
| Duncan to Camden (Arkansas) | 298.15 mi (479.83 km) |
| Duncan to Camden (New Jersey) | 1,304.98 mi (2,100.16 km) |
| Duncan to Cameron Park (California) | 1,307.05 mi (2,103.50 km) |
| Duncan to Camp Pendleton South (California) | 1,118.74 mi (1,800.45 km) |
| Duncan to Camp Springs (Maryland) | 1,197.59 mi (1,927.34 km) |
| Duncan to Camp Verde (Arizona) | 792.30 mi (1,275.09 km) |
| Duncan to Campbell (California) | 1,354.41 mi (2,179.71 km) |
| Duncan to Campbellsville (Kentucky) | 728.72 mi (1,172.76 km) |
| Duncan to Campton Hills (Illinois) | 725.79 mi (1,168.05 km) |
| Duncan to Canby (Oregon) | 1,498.45 mi (2,411.52 km) |
| Duncan to Candelaria (Puerto Rico) | 2,241.28 mi (3,606.99 km) |
