| Penarth to Ilawa | 963.39 mi (1,550.42 km) |
| Penarth to Imielin | 978.23 mi (1,574.31 km) |
| Penarth to Inowroclaw | 910.80 mi (1,465.80 km) |
| Penarth to Janow Lubelski | 1,106.23 mi (1,780.31 km) |
| Penarth to Jarocin | 882.97 mi (1,421.00 km) |
| Penarth to Jaroslaw | 1,128.94 mi (1,816.85 km) |
| Penarth to Jasien | 924.03 mi (1,487.09 km) |
| Penarth to Jaslo | 1,081.97 mi (1,741.26 km) |
| Penarth to Jastrzebie-Zdroj | 954.09 mi (1,535.46 km) |
| Penarth to Jawor | 835.85 mi (1,345.17 km) |
| Penarth to Jaworzno | 979.36 mi (1,576.12 km) |
| Penarth to Jedrzejow | 1,016.93 mi (1,636.60 km) |
| Penarth to Jelcz-Laskowice | 884.59 mi (1,423.61 km) |
| Penarth to Jelenia Gora | 817.57 mi (1,315.76 km) |
| Penarth to Jozefoslaw | 1,031.73 mi (1,660.41 km) |
