| Didcot to Illzach | 465.54 mi (749.21 km) |
| Didcot to Ingre | 289.00 mi (465.09 km) |
| Didcot to Irigny | 494.27 mi (795.45 km) |
| Didcot to Isbergues | 174.14 mi (280.25 km) |
| Didcot to Issoire | 466.20 mi (750.28 km) |
| Didcot to Issoudun | 353.22 mi (568.46 km) |
| Didcot to Issy-les-Moulineaux | 247.02 mi (397.54 km) |
| Didcot to Istres | 629.45 mi (1,013.01 km) |
| Didcot to Ivry-sur-Seine | 250.82 mi (403.66 km) |
| Didcot to Jarville-la-Malgrange | 386.93 mi (622.71 km) |
| Didcot to Jeumont | 249.51 mi (401.54 km) |
| Didcot to Joigny | 324.65 mi (522.48 km) |
| Didcot to Joinville-le-Pont | 252.88 mi (406.96 km) |
| Didcot to Joue-les-Tours | 306.10 mi (492.63 km) |
| Didcot to Jouy-le-Moutier | 230.38 mi (370.75 km) |
