| Mountain Ash to Jeffersonville (Indiana) | 3,905.22 mi (6,284.84 km) |
| Mountain Ash to Jenison (Michigan) | 3,701.38 mi (5,956.79 km) |
| Mountain Ash to Jenks (Oklahoma) | 4,421.69 mi (7,116.03 km) |
| Mountain Ash to Jennings (Missouri) | 4,067.06 mi (6,545.30 km) |
| Mountain Ash to Jensen Beach (Florida) | 4,216.33 mi (6,785.53 km) |
| Mountain Ash to Jericho (New York) | 3,302.03 mi (5,314.10 km) |
| Mountain Ash to Jerome (Idaho) | 4,726.59 mi (7,606.71 km) |
| Mountain Ash to Jersey City (New Jersey) | 3,326.67 mi (5,353.76 km) |
| Mountain Ash to Jessup (Maryland) | 3,506.42 mi (5,643.04 km) |
| Mountain Ash to Johns Creek (Georgia) | 4,048.68 mi (6,515.72 km) |
| Mountain Ash to Johnson City (New York) | 3,344.33 mi (5,382.18 km) |
| Mountain Ash to Johnson City (Tennessee) | 3,864.35 mi (6,219.07 km) |
| Mountain Ash to Johnston (Iowa) | 4,057.95 mi (6,530.64 km) |
| Mountain Ash to Johnstown (Colorado) | 4,532.06 mi (7,293.64 km) |
| Mountain Ash to Johnstown (Pennsylvania) | 3,541.86 mi (5,700.08 km) |
