| Code | Name | Region |
|---|---|---|
| JPIOU | Iwojima, Kagoshima | 46 |
| JPIWT | Iwojima, Nagasaki | 42 |
| JPIWO | Iwojima, Tokyo | 13 |
| JPIYA | Iya | 32 |
| JPIYO | Iyo | 38 |
| JPIYM | Iyomishima | 38 |
| JPUZI | Izu | 22 |
| JPIZH | Izuhara | 42 |
| JPIZU | Izuka | 37 |
| JPIUZ | Izumi | 46 |
| JPIZM | Izumi, Aichi | 23 |
| JPIZI | Izumi, Nagasaki | 42 |
| JPZKU | Izumi, Osaka | 27 |
| JPIZT | Izumiotsu | 27 |
| JPIZS | Izumisano | 27 |
| JPIZO | Izumo | 32 |
| JPJTS | Joetsu | 15 |
| JPJKW | Jokawauchi | 46 |
| JPJON | Jonoshita | 42 |
| JPITA | Itami/hyogo | 28 |
| JPITU | Itoh, Shimane | 32 |
| JPITJ | Itoh, Shizuoka | 22 |
| JPITW | Itoigawa | 15 |
| JPITM | Itoman | 47 |
| JPTSV | Itoshima, Fukuoka | 40 |
| JPITO | Itozaki | 34 |
| JPITS | Itsukushima | 34 |
| JPIWD | Iwade | 30 |
| JPIWH | Iwafune | 15 |
| JPIWG | Iwagi,ehime | 38 |
| JPIWI | Iwaki | 7 |
| JPIWK | Iwakuni | 35 |
| JPIWU | Iwakura Aichi | 23 |
| JPIWA | Iwamatsu | 38 |
| JPIWJ | Iwami | 28 |
| JPHDD | Iwamizawa | 1 |
| JPIWN | Iwanai | 1 |
| JPIAT | Iwata | 22 |
| JPIWY | Iwaya | 28 |
| JPISZ | Isesaki | 10 |
| JPISB | Ishiba | 37 |
| JPISD | Ishida | 42 |
| JPISG | Ishigaki | 47 |
| JPIGK | Ishigaki Apt Okinawa | 47 |
| JPISI | Ishikari | 1 |
| JPICW | Ishikariwan Shinko | |
| JPIKW | Ishikawa | 47 |
| JPISH | Ishima | 33 |
| JPISM | Ishinomaki | 4 |
| JPISO | Ishioka | 8 |