250m mesh link
https://www.e-stat.go.jp/gis/statmap-search?page=1&type=1&toukeiCode=00200521&toukeiYear=2020&aggregateUnit=Q&serveyId=Q002005112020&statsId=T001102&prefCode=10&datum=2000&by_prefecture_flg=1

500m mesh link:
https://www.e-stat.go.jp/gis/statmap-search?page=1&type=1&toukeiCode=00200521&toukeiYear=2020&aggregateUnit=H&serveyId=H002005112020&statsId=T001101&prefCode=10&datum=2000&by_prefecture_flg=1

1km mesh link:
https://www.e-stat.go.jp/gis/statmap-search?page=1&type=1&toukeiCode=00200521&toukeiYear=2020&aggregateUnit=S&serveyId=S002005112020&statsId=T001100&datum=2000&by_prefecture_flg=1&prefCode=10

S = 1km mesh
H = 500m mesh
Q = 250m mesh