expression, noun which may take the genitive case particle 'no', adverb
by prefecture
Used to categorize or present data, statistics, or information according to Japan's 47 prefectures. Often appears in charts, tables, and reports.
See also: 都道府県 (とどうふけん)
This table shows the population by prefecture.
We compiled the data by prefecture.
Refers to the prefectures themselves (Tokyo, Hokkaido, Osaka, etc.), while 都道府県別 means 'by prefecture' or 'per prefecture'.
Compound of 都道府県 (todōfuken, 'prefectures') + 別 (betsu, 'by' or 'according to').