| Llantrisant to Jeffersonville (Indiana) | 3,908.88 mi (6,290.74 km) |
| Llantrisant to Jenison (Michigan) | 3,705.70 mi (5,963.74 km) |
| Llantrisant to Jenks (Oklahoma) | 4,426.07 mi (7,123.08 km) |
| Llantrisant to Jennings (Missouri) | 4,071.22 mi (6,552.00 km) |
| Llantrisant to Jensen Beach (Florida) | 4,217.89 mi (6,788.05 km) |
| Llantrisant to Jericho (New York) | 3,304.86 mi (5,318.66 km) |
| Llantrisant to Jerome (Idaho) | 4,733.23 mi (7,617.40 km) |
| Llantrisant to Jersey City (New Jersey) | 3,329.54 mi (5,358.38 km) |
| Llantrisant to Jessup (Maryland) | 3,509.31 mi (5,647.69 km) |
| Llantrisant to Johns Creek (Georgia) | 4,051.60 mi (6,520.43 km) |
| Llantrisant to Johnson City (New York) | 3,347.62 mi (5,387.47 km) |
| Llantrisant to Johnson City (Tennessee) | 3,867.40 mi (6,223.98 km) |
| Llantrisant to Johnston (Iowa) | 4,062.80 mi (6,538.45 km) |
| Llantrisant to Johnstown (Colorado) | 4,537.72 mi (7,302.76 km) |
| Llantrisant to Johnstown (Pennsylvania) | 3,545.15 mi (5,705.37 km) |
