| Duncan to Kenosha (Wisconsin) | 775.75 mi (1,248.45 km) |
| Duncan to Kent (Ohio) | 1,010.05 mi (1,625.51 km) |
| Duncan to Kent (Washington) | 1,536.81 mi (2,473.25 km) |
| Duncan to Kentwood (Michigan) | 878.21 mi (1,413.34 km) |
| Duncan to Kerman (California) | 1,249.67 mi (2,011.15 km) |
| Duncan to Kernersville (North Carolina) | 1,009.91 mi (1,625.30 km) |
| Duncan to Kerrville (Texas) | 318.92 mi (513.25 km) |
| Duncan to Kettering (Maryland) | 1,205.36 mi (1,939.84 km) |
| Duncan to Kettering (Ohio) | 836.96 mi (1,346.96 km) |
| Duncan to Kewanee (Illinois) | 635.27 mi (1,022.37 km) |
| Duncan to Key Biscayne (Florida) | 1,222.01 mi (1,966.64 km) |
| Duncan to Key Largo (Florida) | 1,231.99 mi (1,982.70 km) |
| Duncan to Key West (Florida) | 1,187.64 mi (1,911.32 km) |
| Duncan to Keystone (Florida) | 1,005.27 mi (1,617.83 km) |
| Duncan to Kihei (Hawaii) | 3,655.16 mi (5,882.40 km) |
