| Llantwit Major to Jeffersonville (Indiana) | 3,908.29 mi (6,289.79 km) |
| Llantwit Major to Jenison (Michigan) | 3,705.88 mi (5,964.03 km) |
| Llantwit Major to Jenks (Oklahoma) | 4,426.32 mi (7,123.47 km) |
| Llantwit Major to Jennings (Missouri) | 4,071.21 mi (6,551.98 km) |
| Llantwit Major to Jensen Beach (Florida) | 4,214.99 mi (6,783.38 km) |
| Llantwit Major to Jericho (New York) | 3,303.32 mi (5,316.19 km) |
| Llantwit Major to Jerome (Idaho) | 4,736.41 mi (7,622.52 km) |
| Llantwit Major to Jersey City (New Jersey) | 3,328.05 mi (5,355.99 km) |
| Llantwit Major to Jessup (Maryland) | 3,507.84 mi (5,645.32 km) |
| Llantwit Major to Johns Creek (Georgia) | 4,050.17 mi (6,518.12 km) |
| Llantwit Major to Johnson City (New York) | 3,346.61 mi (5,385.84 km) |
| Llantwit Major to Johnson City (Tennessee) | 3,866.11 mi (6,221.90 km) |
| Llantwit Major to Johnston (Iowa) | 4,063.62 mi (6,539.77 km) |
| Llantwit Major to Johnstown (Colorado) | 4,539.57 mi (7,305.74 km) |
| Llantwit Major to Johnstown (Pennsylvania) | 3,544.13 mi (5,703.73 km) |
