| Duncan to Carlsbad (California) | 1,113.84 mi (1,792.55 km) |
| Duncan to Carlsbad (New Mexico) | 392.87 mi (632.27 km) |
| Duncan to Carmel (Indiana) | 747.30 mi (1,202.66 km) |
| Duncan to Carmichael (California) | 1,325.00 mi (2,132.39 km) |
| Duncan to Carney (Maryland) | 1,224.72 mi (1,971.00 km) |
| Duncan to Carnot-Moon (Pennsylvania) | 1,051.87 mi (1,692.82 km) |
| Duncan to Carol Stream (Illinois) | 735.41 mi (1,183.52 km) |
| Duncan to Carolina (Puerto Rico) | 2,253.85 mi (3,627.22 km) |
| Duncan to Carolina Forest (South Carolina) | 1,086.58 mi (1,748.68 km) |
| Duncan to Carpentersville (Illinois) | 738.62 mi (1,188.70 km) |
| Duncan to Carpinteria (California) | 1,227.54 mi (1,975.53 km) |
| Duncan to Carrboro (North Carolina) | 1,065.54 mi (1,714.82 km) |
| Duncan to Carroll (Iowa) | 545.87 mi (878.49 km) |
| Duncan to Carrollton (Georgia) | 737.30 mi (1,186.58 km) |
| Duncan to Carrollton (Texas) | 122.22 mi (196.70 km) |
