There are 6,852 islands in Japan. The following shows the number of islands by prefecture. Obviously inland prefectures do not have any island. Other prefectures have some islands except Osaka.
| Prefecture | Number of Islands |
| Nagasaki | 971 |
| Kagoshima | 605 |
| Hokkaido | 508 |
| Shimane | 369 |
| Okinawa | 363 |
| Tokyo | 330 |
| Miyagi | 311 |
| Iwate | 286 |
| Ehime | 270 |
| Wakayama | 253 |
| Yamaguchi | 249 |
| Mie | 233 |
| Miyazaki | 179 |
| Kumamoto | 178 |
| Kochi | 159 |
| Hiroshima | 142 |
| Aomori | 114 |
| Kagawa | 112 |
| Ishikawa | 110 |
| Hyogo | 110 |
| Oita | 109 |
| Shizuoka | 106 |
| Chiba | 95 |
| Niigata | 92 |
| Tokushima | 88 |
| Okayama | 87 |
| Fukuoka | 62 |
| Fukui | 58 |
| Saga | 55 |
| Kyoto | 49 |
| Akita | 47 |
| Aichi | 41 |
| Tottori | 35 |
| Yamagata | 29 |
| Kanagawa | 27 |
| Fukushima | 13 |
| Ibaraki | 7 |
| Toyama | 3 |
| Tochigi | 0 |
| Gunma | 0 |
| Saitama | 0 |
| Yamanashi | 0 |
| Nagano | 0 |
| Gifu | 0 |
| Shiga | 0 |
| Osaka | 0 |
| Nara | 0 |
Source is 5th Regional Coast Guard Headquarters.
www1.kaiho.mlit.go.jp/KAN5/siryouko/monosiri/shima.htm
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