| Duncan to Jeffersonville (Indiana) | 727.36 mi (1,170.57 km) |
| Duncan to Jenison (Michigan) | 869.65 mi (1,399.57 km) |
| Duncan to Jenks (Oklahoma) | 149.03 mi (239.84 km) |
| Duncan to Jennings (Missouri) | 513.27 mi (826.03 km) |
| Duncan to Jensen Beach (Florida) | 1,160.85 mi (1,868.21 km) |
| Duncan to Jericho (New York) | 1,396.19 mi (2,246.95 km) |
| Duncan to Jerome (Idaho) | 1,056.08 mi (1,699.60 km) |
| Duncan to Jersey City (New Jersey) | 1,368.20 mi (2,201.90 km) |
| Duncan to Jessup (Maryland) | 1,208.56 mi (1,945.00 km) |
| Duncan to Johns Creek (Georgia) | 783.34 mi (1,260.67 km) |
| Duncan to Johnson City (New York) | 1,295.48 mi (2,084.87 km) |
| Duncan to Johnson City (Tennessee) | 882.63 mi (1,420.45 km) |
| Duncan to Johnston (Iowa) | 544.01 mi (875.50 km) |
| Duncan to Johnstown (Colorado) | 556.10 mi (894.96 km) |
| Duncan to Johnstown (Pennsylvania) | 1,113.73 mi (1,792.38 km) |
