(Population of Japan by prefecture)
According to the national sensus in 2020/Oct
(The national census is conducted every five years)
| Gookei (total) | 126,146,099 | |
| 1 | Tokyo-to | 14,047,594 |
| 2 | Kanagawa-ken | 9,237,337 |
| 3 | Osaka-fu | 8,837,685 |
| 4 | Aichi-ken | 7,542,415 |
| 5 | Saitama-ken | 7,344,765 |
| 6 | Chiba-ken | 6,284,480 |
| 7 | Hyogo-ken | 5,465,002 |
| 8 | Hokkaido | 5,224,614 |
| 9 | Fukuoka-ken | 5,135,214 |
| 10 | Shizuoka-ken | 3,633,202 |
| 11 | Ibaraki-ken | 2,867,009 |
| 12 | Hiroshima-ken | 2,799,702 |
| 13 | Kyoto-fu | 2,578,087 |
| 14 | Miyagi-ken | 2,301,996 |
| 15 | Niigata-ken | 2,201,272 |
| 16 | Nagano-ken | 2,048,011 |
| 17 | Gifu-ken | 1,978,742 |
| 18 | Gumma-ken | 1,939,110 |
| 19 | Tochigi-ken | 1,933,146 |
| 20 | Okayama-ken | 1,888,432 |
| 21 | Fukushima-ken | 1,833,152 |
| 22 | Mie-ken | 1,770,254 |
| 23 | Kumamoto-ken | 1,738,301 |
| 24 | Kagoshima-ken | 1,588,256 |
| 25 | Okinawa-ken | 1,467,480 |
| 26 | Shiga-ken | 1,413,610 |
| 27 | Yamaguchi-ken | 1,342,059 |
| 28 | Ehime-ken | 1,334,841 |
| 29 | Nara-ken | 1,324,473 |
| 30 | Nagasaki-ken | 1,312,317 |
| 31 | Aomori-ken | 1,237,984 |
| 32 | Iwate-ken | 1,210,534 |
| 33 | Ishikawa-ken | 1,132,526 |
| 34 | Oita-ken | 1,123,852 |
| 35 | Miyazaki-ken | 1,069,576 |
| 36 | Yamagata-ken | 1,068,027 |
| 37 | Toyama-ken | 1,034,814 |
| 38 | Akita-ken | 959,502 |
| 39 | Kagawa-ken | 950,244 |
| 40 | Wakayama-ken | 922,584 |
| 41 | Saga-ken | 811,442 |
| 42 | Yamanashi-ken | 809,974 |
| 43 | Fukui-ken | 766,863 |
| 44 | Tokushima-ken | 719,559 |
| 45 | Kochi-ken | 691,527 |
| 46 | Shimane-ken | 671,126 |
| 47 | Tottori-ken | 553,407 |
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