| Code | Name | Region |
|---|---|---|
| JPISC | Ishiwaki | 31 |
| JPISX | Isozaki | 8 |
| JPISA | Issai | 39 |
| JPIKJ | Isshiki | 23 |
| JPKYR | Isso | 46 |
| JPISU | Isuwan | 46 |
| JPITB | Itabashi | 13 |
| JPITK | Itako | 8 |
| JPIUA | Itakura | 10 |
| JPIDJ | Indohji | 42 |
| JPINE | Ine | 26 |
| JPINS | Innoshima | 34 |
| JPIKZ | Ino | 39 |
| JPINO | Inobe | 46 |
| JPIUH | Inokuchi, Ehime | 38 |
| JPINK | Inokushi, Oita | 44 |
| JPIND | Inonada | 32 |
| JPING | Inugaura | 42 |
| JPINZ | Inujima | 33 |
| JPINY | Inuyama | 23 |
| JPNZA | Inzai | 12 |
| JPIRK | Irago | 23 |
| JPIRA | Iruma | 11 |
| JPISS | Isa | 46 |
| JPISY | Isahaya | 42 |
| JPIS3 | Isawa | 19 |
| JPISE | Ise | 24 |
| JPISR | Isehara | 14 |
| JPISK | Iseki | 46 |
| JPOQM | Ikoma | 29 |
| JPIKC | Ikuchi | 34 |
| JPIKU | Ikunohama | 37 |
| JPIMB | Imabari | 38 |
| JPIMA | Imafuku | 42 |
| JPIGR | Imagire | 36 |
| JPIMI | Imari | 41 |
| JPIMT | Imazato | 42 |
| JPIMZ | Imazu | 38 |
| JPIMM | Imi | 44 |
| JPIMU | Imizu | 16 |
| JPINA | Ina | 42 |
| JPINJ | Ina Saitama | 11 |
| JPINN | Ina, Nagano | 20 |
| JPINB | Inabe | 24 |
| JPIAI | Inagi | |
| JPINM | Inami | 28 |
| JPIHK | Inashiki | 8 |
| JPINR | Inatori | 22 |
| JPIZW | Inazawa | 23 |
| JPIES | Ieshima, Hyogo | 28 |