| Code | Name | Region |
|---|---|---|
| JPIER | Ieura | 37 |
| JPGMA | Iga | 24 |
| JPIGO | Igo | 32 |
| JPIHO | Ihota | 35 |
| JPIII | Ii | 35 |
| JPIIB | Iibi | 32 |
| JPIDA | Iida | 17 |
| JPLJM | Iijima, Nagano | 20 |
| JPINT | Iinoseto | 42 |
| JPLIY | Iiyama | 20 |
| JPZKA | Iizuka | 40 |
| JPIKR | Ikara | 46 |
| JPIKT | Ikata | 38 |
| JPIKA | Ikeda, Kagawa | 37 |
| JPIKD | Ikeda, Wakayama | 30 |
| JPIKE | Ikeshima | 42 |
| JPIKI | Iki | 42 |
| JPIKN | Ikina | 38 |
| JPIKK | Ikitsuki | 42 |
| JPHRI | Horikappu | 1 |
| JPHSI | Hoshika, Nagasaki | 42 |
| JPHOS | Hoshika, Saga | 41 |
| JPHSM | Hososhima | 45 |
| JPHOT | Hotokegaura | 2 |
| JPHKK | Hyakkan | 43 |
| JPHYR | Hyakunoura | 38 |
| JPHOG | Hyogo | 28 |
| JPHYU | Hyuga | 45 |
| JPHYG | Hyugadomari | 44 |
| JPIAK | Ibaraki | 27 |
| JPIBI | Ibiwaga | 21 |
| JPIBR | Iburi | 39 |
| JPIBS | Ibusuki | 46 |
| JPICD | Icchoda | 43 |
| JPICH | Ichihara | 12 |
| JPICK | Ichikawa | 12 |
| JPICO | Ichikikushikino | 46 |
| JPIHN | Ichinomiya | 23 |
| JPIEJ | Iejima/okinawa | 47 |
| JPHTS | Hitsushima | 35 |
| JPHWS | Hiwasa | 36 |
| JPHIZ | Hizenohshima | 42 |
| JPHUD | Hoda | 32 |
| JPHOF | Hofu | 35 |
| JPHHM | Hohomi | 32 |
| JPHJO | Hojo | 38 |
| JPHOK | Hoki | 31 |
| JPHKY | Hokuei | 31 |
| JPHKO | Hokuto | 19 |
| JPHOO | Hokuto Hokkaido | 1 |