| Duncan to Richmond (California) | 1,376.74 mi (2,215.65 km) |
| Duncan to Richmond (Indiana) | 803.95 mi (1,293.83 km) |
| Duncan to Richmond (Kentucky) | 790.96 mi (1,272.93 km) |
| Duncan to Richmond (Texas) | 365.27 mi (587.84 km) |
| Duncan to Richmond (Virginia) | 1,158.47 mi (1,864.38 km) |
| Duncan to Richmond Heights (Florida) | 1,213.58 mi (1,953.06 km) |
| Duncan to Richmond Heights (Ohio) | 1,014.02 mi (1,631.91 km) |
| Duncan to Richmond Hill (Georgia) | 976.00 mi (1,570.72 km) |
| Duncan to Richmond West (Florida) | 1,211.58 mi (1,949.85 km) |
| Duncan to Richton Park (Illinois) | 732.05 mi (1,178.11 km) |
| Duncan to Ridge (New York) | 1,431.59 mi (2,303.92 km) |
| Duncan to Ridgecrest (California) | 1,116.77 mi (1,797.27 km) |
| Duncan to Ridgefield (New Jersey) | 1,372.41 mi (2,208.68 km) |
| Duncan to Ridgefield (Washington) | 1,513.17 mi (2,435.21 km) |
| Duncan to Ridgefield Park (New Jersey) | 1,372.43 mi (2,208.71 km) |
